Updated Punnett Square Practice Worksheet (Edited) | PDF ... - Free Printable

Great! Let's go through the Punnett Square Practice Worksheet step by step and verify or correct the answers, explaining each part clearly.

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1) Determine Phenotypes from Genotypes

#### Flower Color:
- Purple flowers (P) are dominant to white flowers (p).
- PP → Purple (homozygous dominant)
- Pp → Purple (heterozygous — dominant allele shows)
- pp → White (homozygous recessive)

✔ Your answers:
- PP → Purple ✔
- Pp → Purple ✔
- pp → White ✔

#### Hairy Knuckles in Humans:
- Hairy knuckles (H) are dominant to non-hairy (h).
- HH → Hair ✔
- Hh → Hair ✔ (since H is dominant)
- hh → No hair ✔

#### Cat Tails:
- Bobtails (t) are recessive, normal tails (T) are dominant.
- TT → Normal tail ✔
- Tt → Normal tail ✔ (T is dominant)
- tt → Bobtail ✔

✔ All your answers for Question 1 are correct.

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2) Identify Genotype Type

Determine if each genotype is:
- Homozygous dominant (same alleles, both dominant)
- Homozygous recessive (same alleles, both recessive)
- Heterozygous (different alleles)

| Genotype | Answer | Explanation |
|---------|--------|-----------|
| AA | Homozygous dominant ✔ | Both alleles are A (dominant) |
| gg | Homozygous recessive ✔ | Both alleles are g (recessive) |
| Pp | Heterozygous ✔ | One dominant (P), one recessive (p) |
| Ii | Heterozygous ✔ | One dominant (I), one recessive (i) |
| tt | Homozygous recessive ✔ | Both alleles are t (recessive) |
| TT | Homozygous dominant ✔ | Both alleles are T (dominant) |

✔ All your answers for Question 2 are correct.

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3) Dog Fur Color – Punnett Square

Given:
- Gene for fur color:
- F = Grey fur (dominant)
- f = Black fur (recessive)
- Female dog: Heterozygous → Ff
- Male dog: Homozygous recessive → ff

We use a Punnett square to determine offspring genotypes and phenotypes.

#### Punnett Square Setup:

```
f f
---------------
F | Ff | Ff
---------------
f | ff | ff
---------------
```

So, the possible genotypes of puppies:
- Ff: 2 out of 4 → 50%
- ff: 2 out of 4 → 50%

#### Genotype Percentages:
- FF: 0% ✔ (not possible — neither parent has F and F)
- Ff: 50% ✔
- ff: 50% ✔

#### Phenotype Percentages:
- Grey fur (needs at least one F): Ff → 50% ✔
- Black fur (only ff): 50% ✔

Your answers are all correct!

You've filled in the Punnett square correctly:
```
f f
-----------
F | Ff | Ff
-----------
f | ff | ff
```

And you wrote:
- % of genotypes:
- FF: 0%
- Ff: 50%
- ff: 50%
- % of phenotypes:
- Black fur: 50%
- Grey fur: 50%

✔ Perfect!

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✔ Final Summary:

All your answers on this worksheet are correct. You’ve demonstrated a solid understanding of:
- Dominant vs. recessive traits
- Genotype vs. phenotype
- Homozygous vs. heterozygous
- Using Punnett squares to predict offspring outcomes

Well done! 🎉

Let me know if you'd like help with more complex problems (like dihybrid crosses or incomplete dominance).