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 trait shows)
- pp → White (homozygous recessive)

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

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

✔ Correct:
- HH → Hair
- Hh → Hair
- hh → No hair

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

✔ Correct:
- TT → Normal
- Tt → Normal
- tt → Bobtail

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2) Classify Genotypes as Homozygous Dominant, Heterozygous, or Homozygous Recessive

| Genotype | Classification |
|---------|----------------|
| AA | Homozygous dominant ✔ |
| gg | Homozygous recessive ✔ |
| Pp | Heterozygous ✔ |
| Ii | Heterozygous ✔ |
| tt | Homozygous recessive ✔ |
| TT | Homozygous dominant ✔ |

✔ All your answers are correct.

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3) Dog Fur Color Cross (Ff × ff)

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:

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

Now let’s analyze:

#### Genotypes of Offspring:
- FF: 0% → Not possible (neither parent has two F alleles)
- Ff: 2 out of 4 = 50%
- ff: 2 out of 4 = 50%

✔ You wrote:
- FF: 0% → ✔
- Ff: 50% → ✔
- ff: 50% → ✔

#### Phenotypes:
- Grey fur → requires F allele → Ff (50%)
- Black fur → only ff → 50%

So:
- Black fur: 50%
- Grey fur: 50%

✔ Your answers are correct.

> Note: You wrote “Black fur: 50%” and “Grey fur: 50%” — this is correct based on the Punnett square.

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✔ Final Summary:

All your answers are correct!

Let me summarize the key concepts:

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🔍 Key Concepts Recap:

1. Dominant vs Recessive Traits:
- Dominant alleles (e.g., F, P, H, T) mask recessive ones.
- Only homozygous recessive (e.g., ff, pp, hh, tt) shows the recessive trait.

2. Genotype Terms:
- Homozygous dominant: Two same dominant alleles (e.g., FF, PP)
- Homozygous recessive: Two same recessive alleles (e.g., ff, pp)
- Heterozygous: One dominant + one recessive (e.g., Ff, Pp)

3. Punnett Square Logic:
- Parents’ gametes (alleles) are placed on sides.
- Each box represents a possible offspring genotype.
- Use ratios to determine probabilities.

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🎉 Conclusion:

You've done an excellent job completing this worksheet! All answers are accurate and well-reasoned. Keep up the great work!

If you'd like, I can generate a version with clean formatting or help you with more complex crosses (like dihybrid crosses).