Essays on Gametes

The chromosomal theory of inheritance is a theory that defines the role of the chromosomes in the execution of the process of Mendelian inheritance (Waddington, 2016). The theory makes a maximum application of the Mendelian laws of inheritance based on various observations. Some of the observations affiliate to the laws includes; the migration of the homologous pairs of chromosomes as discrete structures independent of the other pairs that exist in the same strand. In addition, the theory explains the random process of the pre-gamete occupation of each homologous pair of chromosomes (Waddington, 2016). The parent contributes half of the ...

Gregor Mendel's studies laid the foundation for modern genetics. In a series of elegant experiments, Mendel was able to deduce the most fundamental laws of single-gene and multiple-gene inheritance without having the scientific data on chromosomes, their structure, or meiotic segregation. In this lab, you will learn about and apply examples for 3 different patterns of human inheritance of traits.

Punnett Square is a tool used to theoretically predict genotypes of the progeny from the genotypes of parents as a result of sexual reproduction. Genes from parental gametes are written as rows and columns of the Punnett Square. All ...

Question 1

Angiosperms can be dioecious or monoecious and they go through sexual production (Raghavan, 1999). Angiosperm flowers are considered to be hermaphroditic or androgynous because the same flower contains both female and male gametophytes. However, angiosperm flowers with only female gametophytes are incomplete and considered to be either a carpellate flower containing only female parts or a staminate flower containing only male structures. The male reproductive structure of the angiosperms is known as andoecium. The anthers that are found in the stamens of the angiosperms contain pollen sacks, which have the microsporocytes. The cells go through a process known as ...

A General Outlook on Meiosis and Mitosis Processes

Compare and contrast mitosis and meiosis. Think phases, starting and ending products, chromosome numbers, the purpose of each, and the cell types that complete each type of division. Be sure to do a DIRECT compare and contrast, and write in paragraph form - Mitosis involves one cellular division resulting in identical daughter cells while meiosis involves two cellular divisions resulting in different daughter cells. Meiosis produces four haploid cells while mitosis produces two diploid cells- this ensures genetic diversity by sexual reproduction in meiosis and cellular reproduction and production of general growth products in mitosis. The chromosome number also ...

Q1. Explain the regulation of the cell cycle

Every cell is regulated by particular checkpoints to ensure that the daughter cells are exact duplications. This is to help guarantee that cell mutations are not passed on to the next generation of cells. In eukaryotic cells, there are three main checkpoints. These are points at which cell replication can be halted until certain conditions are met (Boundless, 2016). The first checkpoint is near the end of the G1 phase. It is here that DNA gets evaluated and checked for damage. If damage has occurred, it either gets corrected or gets prevented from moving on to the next phase ( ...

Background information

Malaria, a mosquito borne transmissible disease of both human beings and some animals is a pertinent disease in the 21st century which accounts for more than 650, 000 deaths annually (WHO, 1147). The prevalence of malaria is highest in the tropical and subtropical regions. Adverse effects of the disease is an equally major public health issue that affects maternal and child health. In the developing countries, malaria is a leading cause of maternal and child health. Consequentially, it is a pertinent public health disease. This manuscript offers a succinct analysis of the disease while appraising its causative agents, life ...

Consequences of Assortative Mating in Humans

Assortative mating refers to whereby individuals having same genotype mate with each other to produce offsprings’. This changes the genotypic and allelic frequencies in a given population. It is sometimes due to the frequent intra-sexual competition within a population. There are several consequence of assortative mating. It results to homozygosity increase due to phase disequilibrium of gametes. Therefore, the gametes will have no differences. Another consequence is that the variance of the total population will also increase. Genetic effects in a given population are greatly influenced by the assortative mating degree. In a population where assortative mating has occurred, ...

Is Evolution True?

Is Evolution True? Development can be defined as the fundamental process whereby species that are new develop from earlier species through accumulated changes. Sometimes an evolution is described as "descent with modification". As this process of speciation continues to take place, many species start to appear thus becoming increasingly different, and this continues over time and becomes a pattern. Through many observations of the changes in life forms over time, these models have been developed. Charles Darwin explains that the mechanism on hoe evolution occurs is by natural selection. Having constantly been observed, natural selection role in being the ...

Question1

An animal is a multi-cellular organism with cells that are not enclosed in a rigid cell wall. Animals differ from other organisms in two major aspects: 1) through the structure of their cell wall and (2) through their feeding habits. For example, unlike other organisms, such as plants, animals do not have a rigid cell wall. Plants on the other hand have a rigid cell wall. In terms of nutrition, animals are heterotrophs because of the way they synthesize organic compounds. Plants, on the other hand, are autotrophs. Plants are classified as autotrophs because they synthesize organic molecules directly using energy from ...

Natural selection can be referred to as a process through which biological traits turn either more or less common within a population as a function of the impact of hereditary traits on the differential reproductive victory of organisms’ interaction with their surroundings. It is a major evolution mechanism. Charles Darwin popularized the term natural selection with an intention to have it compared with artificial selection, now referred to as selective breeding.

There exists variation within every organism’s populations. This takes place partly since random mutations happen in the genome of an organism, and these mutations can be acquired by offspring. All ...

Introduction

Arable soil can be described as soil tilled or ploughed regularly, usually under a crop rotation system. It is also an agricultural soil that is filled by crops sown as well as harvested in a similar agricultural year, at times over one time. Soil can as well be regarded as arable if it is utilized as temporary hayfields for pasture or mowing, kitchen and market gardens, and temporary fallow land. This means that this kind of soil is not sown for one or more seasons of growing, but it is not left to lie idle for over five years. Arable soil ...

1) Proto-Oncogenes and Tumor Suppressor Genes are two types of genes that ordinarily keep the cell cycle functioning as it should. Explain the roles of these two types of genes, and explain what can occur when these types of gene are not working properly. Provide at least two different examples of cancers associated with mutations of these types of genes.

The purpose of the proto-oncogenes under normal circumstances is to make sure that cells proliferate, in other words the oncogenes stimulate cell production. But when a normal, healthy ocogene cell becomes mutated or expresses at higher than normal levels it causes cancer. The first oncogenic virus was discovered in 1916 and called the Rous virus after the person who discovered it, Peyton Rous. Rous viruses represent a family of viruses called the retro viruses. Retro viruses contain a genetic material called ribonucleic acid (RNA).

There is always the possibility that RNA will be transcribed into DNA (deoxyribonucleic acid) by an enzyme of ...

Human embryo stem cell research is an emerging field in medical science which has raised serious ethical issues. It is still a matter of debate whether or not this technique should be employed for the research purpose and what would be the end result of the embryo. Since the research process has advanced a lot, the prime focus at the present time is not to decide whether or not it should be done but to determine ways to maintain the privacy. The government looked into the matter of human stem cell research because those derived from animal sources had potential ...

Lab report

Introduction. The Mendelian genetic effort, revolve around the inheritance of biological characteristics that trail the proposed Mendelian laws brought forward by Gregor Mendel (He & University of Chicago, 46). These regulations advocate for independent assortment, trait dominance in alleles, and the segregative capability of alleles. Thus the hypothetical endeavor of this report is to ascertain the identity of the first filial generation -F1, based on the phenotypic quotients of the second filial-F2 cohorts Fruit fly drosophila is considered ideal in genetic experiments, because they share the majority of their genes that cause diseases with humans up to 75 ...

1. The alleles we inherit from our parents get expressed as outward traits. For almost all traits, one allele will be expressed and the other will not. If one of your alleles is dominant, its trait will be expressed. If both alleles are recessive, their trait will be expressed. Each of the traits in the table below follows a simple dominant/recessive system. For each trait, circle whether you have a dominant or recessive trait.

Trait Dominant Recessive

When a diploid organism (remember, carries two alleles for each gene!) has two of the same allele, we call it homozygous. When it has two different alleles, we ...

Introduction:

Scientists believe that the gymnosperms developed from an extinct phylum whose members reproduced through spores (E. Taylor, T. Taylor, & Krings, 2009). The first true gymnosperms, however, produced seeds instead of spores. As a result, the evolution of the seeds became a fundamental adaptation of the gymnosperms to the dry conditions on land. The second factor that made the group successful on land was the development of pollen grains, which transported and protected the male gametes. Hence, unlike the seedless vascular plants, the gymnosperms became less dependent on the aquatic conditions for the success of fertilization. Instead, they gained the ability to ...

Introduction

Mutation induces the formation mRNA strands that are formed later that they are converted into a native protein. Mutational causes the peptide formed develop a structure similar to a protein. Antimicrobial peptide formed after mutation depends on the chemical property. Mutation causes bacteria to increase in the peptide leading to low hemolytic function. Bacteria lead to anoplin to causing the shape of peptide to form a protein like shape that is spectroscopy. Mutation causes the chain of the peptide to form a protein structure that later forms a tertiary that is the antigen molecule responsible for forming the body immune system. The chains amino ...

The cell is the basic unit of all the living organisms. It contains many important structures like chromosomes, which are responsible for the genetic makeup of an organism (Wasserman 111). The cells of an organism undergo a process known as cell division. In this process, a parent cell splits into two or more daughter cells (Wasserman 111). There are two types of cell division namely meiosis and mitosis. It is pertinent to note that, difference is that in mitosis the number of the daughter cells are two whereas, meiosis creates four daughter cells (Wasserman 120). Another thing that differentiates the ...

Sex linkage is the expression of Phenotypic allele that depends on the gender of an individual and is linked directly to the sex chromosomes the individual has. In mammals, the male sex is most likely to show the recessive sex linked traits. Genotype is the genetic compositions of an individual and it refers to the genes an individual has in a genome. It determines the characteristics of a person and how he or she responds to certain stimulus. Phenotype, on the other hand, is the physical characteristics or the appearance of an individual. These can be seen in things like the ...

Abstract

This essay aims to explore several scientific issues: the relation between the burning of fossil fuels and its consequential unbalance of the carbon cycle and the increase of the greenhouse effect that follows it, causing a biosphere change with multiple deleterious effects, both on environments, species and life itself; understand how Darwin’s theory of Natural Selection explains the existence of different species of a being (such as lizards) in one same island; why, now in the Genetics area, a cell’s DNA is only visible during mitosis for being condensed, why “daughter cells”, in meiosis, all have unique genetic material, caused ...

Definition and Causation of Edward’s Syndrome

Edwards’s syndrome is a condition and severe genetic disorder caused by a chromosomal defect. The syndrome occurs in approximately 1out of every 6,000 live born infant (Trisomy 18 Foundation, 2010). A human bring is supposed to have 46 chromosomes, of which, 23 are obtained from the mother while the other 23 are obtained from the father. With in mind that conception is usually the fusion of male and female gametes (sperm and ovum), in case of an error in the formation of any of the two gametes, there is a high prospect that the baby formed from such gametes will ...

Introduction

Genetic evolution refers to change(s) in inheritable traits occurring across succeeding generation of organisms. The change (evolution) is responsible for the diversity at all levels including the molecular level e.g. genetic variations, individual organisms in the same species (intra-species variations) and among species (interspecies variations). It is believed that all organisms emanated from common ancestry about 3.7 billion years ago and then evolved over time to the present biodiversity. Therefore all organisms have some shared traits at the morphological and molecular level with the species sharing a more recent ancestry having more similar traits. The process of evolution involves ...

1. Task one critically reflect on the meaning of the flowing sentence " the key to seeing these infant initial seeking and feeding behaviors is to permit both mothers and baby to be calm, relaxed and interacting with each other, with no other agenda"

There are many factors which influence an infants feeding behavior and most of these factors are determined by the mother. Failure to maintaining a conducive environment for a child’s feeding behavior may result to poor feeding and hence child malnutrition. Once this occurs, the infant is prone to illnesses that are nutrition related. It is therefore the ...

How an Animal Cell Survives

Although the animal cell is similar in many ways to eukaryotic as well as some few eukaryotic cells, there are strikingly large differences between them, especially the requirements for survival in various environments (Baitsell, 2008). The animal cell is one of the members of eukaryotic cell category, whose structure is quite complicated by the organelles present as well as the diverse functions they play towards the survival of the cell and the organism in general (Solomon, Berg, & Martin, 2004). The cell structure is defined by a plasma membrane that bounds a number of organelles, all of which function towards the ...

Meiosis and mitosis

Gene transfer occurs during cell division from mother cells to daughter cells. The DNA carries the genetic information transfer which it from one cell to another during cell division. Genes are located on the DNA strand that is contained in a chromosome. Mitosis and meiosis are the two types of cell division that occur during reproduction in various organisms. Mitosis involves the nucleus dividing into two identical daughter cells. Mitosis goes in hand with cytokinesis, which result in two separate daughter cells at the end of division. The process of mitosis takes place in four phases namely the prophase, metaphase, ...