Question

1. in guinea pigs, rough coats (with lots of swirly cowlicks) are dominant over smooth coats. if an rr guinea pig is crossed with a rr guinea pig, what are the possible genotypes and phenotypes of the offspring? what are the chances of each? fill in the table: genotype phenotype chance

Explanation:

Step1: Determine the gametes

The RR guinea pig can only produce R gametes. The Rr guinea pig can produce R and r gametes.

Step2: Create the Punnett square

	R	R
r	Rr	Rr

Step3: Analyze genotypes

From the Punnett square, the genotypes are RR and Rr.

Step4: Analyze phenotypes

Since R (rough coat) is dominant over r (smooth coat), both RR and Rr will have rough coats.

Step5: Calculate chances

There are 2 RR (out of 4) and 2 Rr (out of 4). So the chance for RR is $\frac{2}{4}=\frac{1}{2}$ (50%) and for Rr is $\frac{2}{4}=\frac{1}{2}$ (50%).

Answer:

Genotype	Phenotype	Chance
Rr	Rough coat	50%