Genetics practice worksheet featuring monohybrid and dihybrid crosses with problem-solving exercises and a DNA double helix diagram.

Let’s solve this step by step.

We are told:

> In hamsters, gray fur (G) is dominant to white fur (g).
> A male hamster that is heterozygous for gray fur mates with a female hamster that has white fur.
> What is the chance their offspring will have white fur?

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Step 1: Understand the genotypes

- Gray fur is dominant → represented by G
- White fur is recessive → represented by g

“Heterozygous” means having two different alleles → so the male is Gg

The female has white fur → since white is recessive, she must be gg (only way to show recessive trait)

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Step 2: Set up Punnett Square

Male parent: Gg
Female parent: gg

Punnett square:

```
| g | g
---------------------
G | Gg | Gg
---------------------
g | gg | gg
```

So the possible offspring genotypes:

- Gg → gray fur (because G is dominant)
- Gg → gray fur
- gg → white fur
- gg → white fur

That’s 4 total possibilities:

→ 2 out of 4 are Gg (gray)
→ 2 out of 4 are gg (white)

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Step 3: Calculate probability of white fur

White fur = genotype gg

Number of gg outcomes: 2
Total outcomes: 4

Probability = 2/4 = 1/2 or 50%

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Final Answer:
50%