Question

In a cross between a white-eyed female and a red-eyed male, why are a few white-eyed females and red-eyed males produced? Explain with the help of an appropriate cross(es).

Answer 1

The cross of white eyed female with red eyed male gives red eyed females and white eyed males. Rarely this cross may give all white eyed females and red eyed males. This results from non-seperation of two homologous X chromosomes during anaphase I of meiosis. Both X chromosomes go together to same pole resulting in formation of one XXY (white eyes female) and red eyed males. This phenomenon is known as non disjunction of two X chromosomes. Hence, option C is correct.

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Answer 2

In Morgan's experiments on linkage, the percentage of white eyed, miniature winged recombinants in F2 generation is 37.2.Linkage is the phenomenon · In one mating, Morgan took a red-eyed male and mated it with a white-eyed female. He predicted and