Question

Directions: Type your answer in the box.

The variation of kemel color in com plants is an inherited trait. R is the dominant allele for red kernels in a com plant and r is the recessive allele for yellow kernels

What is the probability that a com plant with the genotype Rr crossed with a com plant ir will have offspring with the genotype rr?

Express your answer as a fraction using numerals for numbers and/ for the fraction bar. Do not include spaces.

Answer 1

The possible genotypes of the offspring from a cross between a Rr (red kernel) plant and a rr (yellow kernel) plant can be determined using a Punnett square.

1. The alleles from the Rr parent can be R or r.
2. The alleles from the rr parent can only be r.

The Punnett square looks like this:

```
r r
-----------
R | Rr Rr
-----------
r | rr rr
```

The possible genotypes of the offspring are:
- Rr (2 occurrences)
- rr (2 occurrences)

Out of a total of 4 possible genotypes, 2 of them are rr.

Thus, the probability of obtaining offspring with the genotype rr is:

\[
\frac{2}{4} = \frac{1}{2}
\]

So, the final answer is:

1/2