Question

A red eye heterozygous female fruit fly is crossed with a red eye male workout all possible genotype and phenotype of the progeny comment on the pattern of inheritance of eye colour in fruit flies

Answer 1

Answer:

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Let R = red and r = not red

Rr x Rr (if the male is heterozygous) yields the genotypes RR Rr, Rr, rr

so there is a 75% chance of having red eyed offspring

Rr x RR (if the male is homozygous)

yields the genotypes RR, RR, Rr, Rr

so there is a 100% chance of having red eyed offspring

...this is calculated using a punnett square, but assumes of course that the gene that codes for red eyes is dominant over genes coding for other eye colours.

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