5. 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
Parent 1
Parent 2
Allele key
Dominant
C- Curly wing
B - Brown body
L-Legs on head
R- Red eyes
Recessive
C - normal wing
b - black body
I - antenna
r- orange eyes

The answer is B because with 3/4 of the L trait being dominant, it’s impossible to have an offspring with the recessive trait

Explanation:

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Correct B, Offspring B.

The genotype of the parents are CcBbLLRR and CcBbLlRr respectively. Crossing over takes place between 2 non-sister chomatids. After crossing over between the parents there are possibilities of forming 3 types of offsprings as depicted in the above image: ccBbLlRr, CcBBLlRR and ccbbLLRr. The offspring B with heterozygous condition for eye colour will have Rr genes. R- red colour is the dominant color over orange color.

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