Question

14. In guinea pigs, short hair, S, is dominant to long hair, s. Complete the following Punnett squares according to the directions given. Then, fill in the blanks beside each Punnett square with the correct numbers. a. One guinea pig is Ss and one is ss. Expected number of offspring: ____ Short hair (SS or Ss) ____ Long hair (ss)

Answer 1

To complete the Punnett square for the cross between one guinea pig with the genotype Ss (short hair) and one with the genotype ss (long hair), we set it up as follows:

```
S s
----------------
s | Ss | ss |
----------------
s | Ss | ss |
----------------
```

From this Punnett square:

- The offspring genotypes are:
- Ss (short hair)
- ss (long hair)

Now, let's count the expected number of each phenotype from the Punnett square:

- Short hair (Ss): 2 offspring
- Long hair (ss): 2 offspring

Therefore, the expected number of offspring is:

Expected number of offspring: **2** Short hair (SS or Ss) **2** Long hair (ss)