6. Wild-type eye color in mice is black. You are studying the genetics of a rare
ID: 143128 • Letter: 6
Question
6. Wild-type eye color in mice is black. You are studying the genetics of a rare mutation that results in blue eyes. Your prior work indicates that this eye color phenotype is monogenic. You set up a large number of crosses between blue-eyed females and black-eyed males and obtain the following 26 blue-eyed females 22 black-eyed females 27 black-eyed males a) What could explain the observed frequencies or these eye color phenotypes and their distribution between males and females in the offspring produced from your crosses? (Hint: what is missing? What is the mode of inheritance?) (1pt) yed females you used in your parental cross heterozygous or homozygous for the eye color gene? (0.5pt) c) Does the blue eye allele have a dominant or recessive effect on eye color? (0.5pt) 7. A baby boy is born with purple hair. Wow! A genetic councilor determines that both parents are carriers for the extremely rare, autosomal recessive purple hair allele (p). What are the chances?! Seriously, what are the chances that their next child will be what they are hoping for a purple-haired girl? (1pt)Explanation / Answer
a]Blue eye colour is found in heterozygous recessive condition and hence it is found in females and because the mutation is dominant over the domainant allele.Inheritence pattern is autosomal dominant.
b]Homozygous
c]Dominant effect
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