Study Biology

Question 3

(Short Answer)

When considering the inheritance of multiple independent traits, it is often simpler to multiply the probability of each individual trait to determine the probability of the overall phenotype. Assuming inheritance is independent, in a cross between two tall pea plants with yellow round peas and purple flowers, genotype YyRrTtPp, what is the probability that offspring will be tall and have white flowers and produce yellow wrinkled peas? Your answer should be the value of A in the fraction A/256

Answer

9
Explanation: The probability that offspring will be tall and have white flowers and produce yellow wrinkled peas is 9/256. For each single trait there is a 3:1 inheritance ratio between the dominant and recessive trait. ¾ of offspring are tall, ¼ have white flowers, ¾ have yellow peas, and ¼ have wrinkled peas. Therefore, the probability of having all these traits is ¾ x ¼ x ¾ x ¼ = 9/256

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