You are studying the genetics of hair characteristics in mice. You find two new

Question

You are studying the genetics of hair characteristics in mice. You find two new interesting mutants one with abnormally thick hair and one with abnormally curly hair. You describe these new mutants to three of your colleagues. The first colleague says that she has seen the mutants before and that they can be explained by two co-dominant alleles of the same gene. The second colleague says he too has seen mutants like these before but tells you that they are due to two

Incompletely dominant alleles. The third colleague thinks the two mutants can be explained by two alleles of the same gene and that thick hair is dominant to curly hair. Assume you have a true breeding strain of each mutant. Could you determine which of your colleagues is right by looking at F1 progeny from crossing the two strains or would you have to look at F2 progeny? What would the F1 progeny look like if the mutants were allelic and were i) co-dominant ii) incompletely dominant or iii) completely dominant?

Explanation / Answer

first of all if a gene is completely dominant over the other, you will see it in F1, which ever phenotype is dominant. if it is codominance or incompletely dominant, neither of the parental phenotype will be found. after that you can separate codominance or incompletely dominant by following observation

With incomplete dominance, a cross between organisms with two different phenotypes produces offspring with a third phenotype that is a blending of the parental traits.

With codominance, a cross between organisms with two different phenotypes produces offspring with a third phenotype in which both of the parental traits appear together.

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