NAME: SPRING 2018 BIOL 303.001 (GENETICS) Chapter 4 Written Exam: Sex Chromosome
ID: 207872 • Letter: N
Question
NAME: SPRING 2018 BIOL 303.001 (GENETICS) Chapter 4 Written Exam: Sex Chromosomes, Sex Determination, and Sex-linked traits Friday, March 9, 2018 Write answers to the following ON THIS EXAM 1.f a fruit fly has 2 autosomes and a single X chromosome and a single Y chromosome, then the sex phenotype of the fruit fly is single Y chromosome, the sex phenotype will be ; if it has 2 autosomes, and two X chromosomes and a 2. Classic recessive red-green color blindness is encoded by a recessive X-linked allele (X), while normal color vision is is encoded by the wild type allele (X"). A woman with normal color vision marries a color blind man, and their first child is a color blind daughter. a) Using the provided annototion, write the genotype of the mother b) write the genotype of the father: c) Using the provided onnotatien, write the genotype of the described first daughter What is the probability of this same couple having: Must show calculation or provide rationale to justify answer to receive credit d) another colorblind daughter? e) a colorblind son? f) a colorblind child (son or daughter)? g) a child with normal color vision?Explanation / Answer
Question no. 1:
Blank a) normal male, because a normal male carries a combination of single X chromosome and a single Y chromosome therefore forming XY as the sex genotype.
Blank b) sterile male with features that of a female, because the genetic constitution of this type of individual comprises of two X chromosomes and one Y chromosome since a normal male carries only a single X chromosome coupled with a single Y chromosome therefore the presence of two copies of X chromosome leads to development of secondary sexual characteristics that specifically belongs to females. And thus the person has characteristics of both female and male .
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