Introductory animal genetics questions.

Briefly explain the roles of each of the following types of Robose Nucleic Acid; Abb.RNA

1. Messenger RNA(mRNA)
2. Transfer RNA(tRNA)
3. Ribosomal RNA(rRNA)
4. Small Nuclear RNA(snRNA)

In few own words how can you best differentiate the two terminologies used during protein synthesis namely transcription and translation.

One stage of cell cycle is called “resting stage” when the cell is considered to be resting . However, Iam of the argument that the stage be renamed “cell division preparatory stage”. How do you consider supporting my argument with evidences?

Explain the major events taking place in each one of the following phases of animal cell division

1. Metaphase stages of mitosis and meiosis
2. Mitotic prophase
3. Anaphase stage in mitosis and anaphase II stage in meiosis II
4. Mitosis telophase as well as telophase I and II in meiosis
5. Zygotene (zygonema) stage of prophase I

Differences in characteristics such as productivity or disease resistance among animals are contributed by several factors including genes, genetic make-up and environment. With examples discuss how genes and the environment cause differences in animals.

1. In one mating project in pigs, two traits were considered a black -solid (BBww) coat and red-belted (bbWW) coat. If the boer had a black -solid coat and the sow was red-belted

1. What is the resulting genotype and phenotype of F1 progenies? Show how you arrive to your answer.
2. Draw a punnet square and show the phenotypic and genotypic ratios of F1 progenies were mate interse or among themselves to produce F2s

In F2 generation of a chicken breeding experiment, 3629 chicks had red feathers and 1145 had white feathers. A 3:1 ratio was expected. Use chi square and show if there is any discrepancies between the observed and expected data. You can use the following table values for chi square; 5%=3.84 of 1%=6.64. The degree of freedom is 1.

1. Draw a sketch of the Watson and Crick double helix DNA molecule, label and name the important features.
2. Draw thestructures of both Deoxyribose and Ribose sugar and show the major differences between them.
3. Draw a figure representing a gene and show the important parts.