Question

One unusual male heterozygous for cn and st alleles, when crossed to a white-eyed female, produced only wild-type and white-eyed progeny. Explain the likely chromosomal constitution of this male.

Answer 1

Answer: The cn+/cn st+/stoffspring have the chromosomal that is opposite in arrangement of the cn/cn st/st Offspring.

Step-by-step explanation:

Indicators on different chromosomes 2 and 3 are showing pseudolinkage, and also the males show there are no crossovers to the separate the markers/indicators in recombinants. Reciprocal translocation between chromosome 2 and 3 is what the unusual male has.

This means that either the recessive cn and st alleles are both on the normal chromosomes 2 and 3, and the dominant wild-type cn+ and st+ alleles are on the translocation chromosomes 2 and 3, Or The dominant wild-type cn+ and st+ alleles are both on the normal chromosomes 2 and 3, and the recessive cnand stalleles are on the translocation chromosomes. When crossed to cn/cn st/st white-eyed female with normal chromosomes, cn/cn st/st offspring might have two pairs of normal chromosomes 2 and 3 or a normal chromosome 2, translocation chromosome 2, normal chromosome 3, translocation 3. The cn+/cn st+/stoffspring have the chromosomal that is opposite in arrangement of the cn/cn st/st offspring.