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Genetic Variation

Genetics as it applies to evolution, molecular biology, and medical aspects.

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Genetic Variation

Postby Diana Timpano » Fri Apr 08, 2005 2:56 pm

Hi, Last night I had a genetic variation lab which required my lab partner and I to determine the traits of our offspring (The childs genotype and phenotype). This followed with a series of questions which I answered with uncertainess. Here are the questoins:

1) There are three characteristics that demonstate incomplete dominance in this exercise. What are they and why?

MY ANSWER: Hair, skin and eyes I can't put into words why....

2) Could the genes of any two traits in this exercise be located on the same chromosome? Why or why not?

MY Answer: Yes. Because .....something to do with the 46 chromosomes and 28,000 genes.....


3) What type of inheritance pattern best describe how skin color is determined? Ignore albinism.

My answer: Aa, Bb, cc. The products of the polygenic react to one another......???

4) What impact do cases of multiple alleles have on the number of kinds of phenotypes displayed in the population?

My answer: I have no answer. Something to do with having a variation......????

Thanks in advance for your help!!

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Postby mith » Fri Apr 08, 2005 8:31 pm

4. Multiple alleles means more phenotypes! Since the different combinations of alleles to produce different phenotypes are increased.
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Answer 2

Postby cytochromeP » Sat Apr 09, 2005 9:44 am

2) Could the genes of any two traits in this exercise be located on the same chromosome? Why or why not?

Answer: Not Necessarily. Read the Mendels Law of of Independendent Seggregation of gametes (or Independent Assortment). Accordingly, say skin color and hair color r the 2 traits we wish to talk about......There is no reason to expect the factors for above 2 traits to be located on the same or different chromosome. The actual fact will have to determined throug experimentation i.e. thru mapping organism in question.
But the alleles for a particular trait, say hair color will essentially be present on the same chromosome. i.e. the alleles for hair color will be present on the same chromosome and alleles for skin color will again be present on the same chromosome (which may or may not be the same as the former chromosome).
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