A red-eyed heterozyous female fruit fly …
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Meghna Thapar 5 years, 1 month ago
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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