Questions 37 and 38 refer to the folloving: n Drosophila, females heterozygous f

Question

Questions 37 and 38 refer to the folloving: n Drosophila, females heterozygous for the recessive alleles c, , and e were crossed to males homozygous recessive for these hree mutant genes. The phenotypes of the resulting progeny were: 324 324 cd+ +de 26 26 146 146 cte cde Total progeny 1000 37. How were the three pairs of alleles arranged in the heterozygous females? a) +d+ b) +de c)cd+ d) cde cte 38. What is the order of the genes? In this question, the order used in the above data may be incorrect. a) cde b) ced c) dce

Explanation / Answer

37. Answer is d.

d. cde

As the allele belongs to heterozygous females, the order is based on the progeny.

38. Answer is a.

a. cde .

It is based on the recessive alleles of the parent progeny.

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