Genetics Answers

In humans, hemophilia (bleeder’s disease) is a recessive, X-linked trait. Use a Punnett square to show the possible genotypes of offspring of a man who is a hemophiliac, and a normal, but heterozygous woman, where X^H contains the normal clotting gene and X^h contains the gene for hemophilia.

1)    In guinea pigs, black fur is dominant over white fur. How could an animal breeder test whether a black guinea pig is homozygous or heterozygous?

A teenage boy asks his parents “Why do I look similar but slightly different from

my brother?” Using language a layperson would understand, how would you

explain to him about the key events that take place to create this genetic

variation? During what process do these occur and how do they happen? Write 500 words at least.

A teenage boy asks his parents “Why do I look similar but slightly different from my brother?” Using language a layperson would understand, how would you explain to him about the key events that take place to create this genetic variation? During what process do these occur and how do they happen?

In a 39-year-old woman, the 5th pregnancy, which occurred with gestosis and the threat of

termination, ended in labor at 36 weeks. The newbom girl, with a body weight of 2700 g and a body

length of 48 cm, screamed immediately. On examination, there is swelling of the hands and feet, a short

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neck with excessive skin folds, and General muscle hypotension.

Questions: 1. Your diagnosis. Write the karyotype

2. Determine the type of mutation. Describe the mechanism of occurrence of this disease

3. What are the methods of diagnosis of this group of diseases?

evaluate the significant of chromosomal behaviour during cell division and how it leads to variation provide justified arguments as to how crossing over and independent assortment leading to the variation within an organism

discuss the behaviour of the chromosomes during mitosis and meiosis in each stage of cell division

ensure to cover - mitosis - interphase, prophase, metaphase, anaphase, telophase

meiosis - interphase prophase I, metaphase I, anaphase I, telophase I, cytokinesis, prophase II, metaphase II, anaphase II, telophase II, cytokinesis

When a dark blue fish and a light blue fish with dark blue fins were mated , all offspring became dark blue. What could also be seen was that part of the offspring got light gray fins.

Explain with the help of genetics why all fish turn dark blue.

Use relevant terms in your explanation and also show using intersection diagrams.

Now we look at the fins instead. How come some of the offspring get gray fins instead of dark blue like the parents?

When a dark blue fish and a light blue fish with dark blue fins were mated , all offspring became dark blue. What could also be seen was that part of the offspring got light gray fins.

If a sample of DNA is 75 base pairs long, how many amino acids will be present in the polypeptide chain that is fomed?