How many offspring plants from a cross between R_ (round peas) and rr (wrinkled peas) genotypes would need to be examined to be confident at the 1% level that the R_ plant is actually RR?

Question

Quizplus · Accepted Answer

The possible genotypes of R_ are RR and Rr.
If the genotype is RR, then we expect 100% of the offspring to be Rr (round peas).
If the genotype is Rr, then we expect 50% of the offspring to be Rr (round peas) and 50% to be rr (wrinkled peas).
We want to find out how many plants we need to check to be confident that the genotype is really RR, at the 1% confidence level.
If the parent genotype is Rr, then the probability of an offspring being Rr is ½.
To find the probability that ALL offspring have round peas (Rr) with a parent genotype of Rr, we use the product rule.

How Many Offspring Plants from a Cross Between R_ (Round