Practice Problem 72 The fruit fly Drosophila melanogaster has a haploid chromoso

Question

Practice Problem 72 The fruit fly Drosophila melanogaster has a haploid chromosome number of n 4, and 2n 8. Chromosome IV in this species is a tiny autosome. Flies trisomic for chromosome IV are fertile and have no apparent defects The eyeless (ey) and gawky (gw) loci are tightly linked on chromosome I Loss-of-function ey and gw alleles are recessive to ey and gw, respectively. Flies homozygous for ey lack eyes, and flies homozygous for gw have disrupted circadian rhythms. Consider a male fly trisomic for chromosome IV with each of the three chromosome copies bearing different allele combinations for these two loci ey gW ey gw+

Explanation / Answer

Answer is zero

Because no two + allele is present in the same chromosome

ey- gw- ey-gw- ey-gw- ey-ey-gw-gw- ey-ey-gw-gw- ey+gw- ey-ey+gw-gw- ey-ey+gw-gw- ey-gw+ ey-ey-gw+gw- ey-ey-gw-gw+

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