Gce Model Questions Vol1 2023 Biology Question 35
Practice objective / multiple choice question 35 from the 2023 Gce Model Questions Vol1 Biology examination.
In a species with XY sex determination, colour blindness is caused by a recessive allele \(r\) on the X chromosome. A normal male (\(X^{R}Y\)) is crossed with a heterozygous carrier female (\(X^{R}X^{r}\)). Their daughters are then mated with a colour‑blind male (\(X^{r}Y\)). What is the probability that a granddaughter (female) from this second cross is colour‑blind?
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This is Gce Model Questions Vol1 2023 Biology Question 35. It is one of the objective questions from the 2023 Gce Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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