Question

analysis question: which offspring could not arise from the parent cells with the chromosomes shown below? assume crossovers can occur between chromosome pairs in the parent cells. allele key dominant c - curly wing b - brown body l - legs on head r - red eyes recessive c - normal wing b - black body l - antenna r - orange eyes

Explanation:

Step1: Identify alleles in parents

Parents have alleles for various traits. Dominant alleles are C, B, L, R and recessive are c, b, l, r.

Step2: Analyze each offspring

Offspring A has normal - wing (c), brown - body (B), legs on head (L), red - eyes (R). This combination can occur with crossovers. Offspring B has normal - wing (c), black - body (b), legs on head (L), red - eyes (R). This can also occur. Offspring C has normal - wing (c), brown - body (B), antenna (l), red - eyes (R). This is possible. Offspring D has normal - wing (c), black - body (b), antenna (l), orange - eyes (r). But looking at the parent chromosomes, the alleles for eye color are on a different chromosome segment and the combination of alleles in the parents does not allow for an offspring to have both the recessive alleles for body color (b) and eye color (r) in the way shown without violating the linkage relationships shown in the parent chromosomes.

Answer:

Offspring D