Worksheet with Punnett square exercises for determining dog fur color genotypes and phenotypes.

Final Answer:
FF: 25%
Ff: 50%
ff: 25%
Black fur: 75%
Grey fur: 25%

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Explanation:
Okay, let’s go step by step. You’re told both dogs are heterozygous. That means each has one big F and one small f — so their genotype is Ff.

We use a Punnett Square to see what puppies they can have.

Step 1: Write the mom’s genes on top — F and f.
Step 2: Write the dad’s genes on the side — F and f.
Step 3: Fill in the boxes by matching the letters.

Top-left box: F (from mom) + F (from dad) = FF
Top-right box: f (from mom) + F (from dad) = Ff
Bottom-left box: F (from mom) + f (from dad) = Ff
Bottom-right box: f (from mom) + f (from dad) = ff

So we have:
- 1 FF
- 2 Ff
- 1 ff

That’s 4 total puppies.

Now, percentages:
- FF = 1 out of 4 → 25%
- Ff = 2 out of 4 → 50%
- ff = 1 out of 4 → 25%

For phenotypes (what they look like):
- Black fur comes from FF or Ff (because F is dominant).
- So black fur = FF + Ff = 1 + 2 = 3 out of 4 → 75%
- Grey fur only comes from ff → 1 out of 4 → 25%

And that’s it! All done.