13. Chromosome IV in Drosophila is a very small chromosome and carries a tiny am

Question

13. Chromosome IV in Drosophila is a very small chromosome and carries a tiny amount of genetic material Fruit flies that are trisomic for chromosome IV have no apparent phenotypic abnormalities, and they retain their fertility. Among the genes on chromosome IV is one for which a recessive allele ey produces the "eyeless" phenotype. A male that is trisomic for chromosome IV and has the genotype + ey ey is crossed to a diploid heterozygous female. Assuming that random segregation of chromosomes takes pace during spermatogenesis, and that all sperm are viable, what proportion of offspring will be trisomic and eyeless? a)1/12 b) 1/6 c) 14 d 1/3 e) 1/2

Explanation / Answer

The answer to the above mentioned problem is A) 1/12 as there is only one possible offspring with genotype ey ey ey out of 12 possible offsprings.

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