Your research group is studying an arthropod and trying to map the relative posi
ID: 35654 • Letter: Y
Question
Your research group is studying an arthropod and trying to map the relative position of three genes that are all found on the same chromosome. These genes govern eyes color (Gene E) antennae growth (Gene A) and wing development (Gene W) you find a recessive mutation for each gene and breed populations with phenotypes and genotypes in the diagram below Note: All of the recessive alleles are found on the same chromosome. So without crossing over only two types of gametes can be formed: EAW eaw . a. What is the phenotype of each recessive allele ? Eyes, ee Antennae, aa wing, ww b. You know that without crossing over population #1 can make only two types of gametes: EAW and ea What gametes can be produced by the other populations? Population#2 Population #4Explanation / Answer
Eyes, ee: Black or coloured eyes
Antennae, aa: Short with rounded tip
Wings, ww: Short
Population # 1 was heterozygotic hence they can produce two types of gametes whereas Population # 2, 3 and 4 are homozygotic. So they all produce only one type of gamete. The type of gametes produced by each of these populations are as follows:
Population # 2: eAw
Population # 3: eaW
Population # 4: Eaw
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