Completed biology worksheet on monohybrid crosses featuring vocabulary matching and Punnett square problems with circled answers.

Let’s go through each part of the worksheet step by step to make sure everything is correct.

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Part A: Vocabulary

We are matching definitions to terms.

1. “genotypes made of the same alleles” → That means both alleles are identical, like AA or aa. That’s homozygous → D

2. “different forms of genes for a single trait” → These are called alleles → A

3. “gene that is always expressed” → Even if only one copy is present, it shows up. That’s dominant → B

4. “gene that is expressed only in the homozygous state” → Only shows when there’s no dominant allele — so two copies needed. That’s recessive → E

5. “genotypes made of two different alleles” → Like Aa — one from each parent, different versions. That’s heterozygous → C

✔ All matches look correct.

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Part A: Circle Examples

6. Dominant allele → Should be uppercase letters (since dominant alleles are written with capital letters).
Circled: D, L, N, R, S → All uppercase → ✔ Correct.

7. Recessive allele → Should be lowercase letters.
Circled: n, d, r, k → All lowercase → ✔ Correct.

8. Homozygous dominant → Two uppercase letters, same letter (like AA, BB).
Circled: AA, KK, TT → All correct. Gg is heterozygous — not circled → ✔ Good.

9. Homozygous recessive → Two lowercase letters, same letter (like aa, bb).
Circled: ee, qq, ww → All correct. Ff, HH, Oo, Uu are not homozygous recessive → ✔ Good.

10. Genotypes in which dominant gene must show → This means any genotype with at least one dominant allele (uppercase). So: AA, Dd, EE, Jj, RR, Ss → All have at least one capital → ✔ Correctly circled. ff has no dominant → not circled → good.

11. Genotypes in which recessive gene must show → Only when there’s NO dominant allele — so only homozygous recessive: aa, rr → Circled correctly. Others have at least one capital → not circled → ✔ Good.

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Part B: Punnett Squares

12. Examine Punnett squares and circle those that are correct.

First square (circled):
Parent 1: D and d
Parent 2: d and d
Offspring:
Top row: Dd, dd
Bottom row: Dd, dd
→ Correct. Each box combines one allele from top and one from side. ✔

Second square:
Parent 1: D and D
Parent 2: d and d
Should give all Dd. But here it says:
Top row: Dd, DD → ✘ Wrong! DD can’t happen if both parents give d.
Actually, should be all Dd. So this square is incorrect → Not circled → ✔ Good.

Third square:
Parent 1: A and a
Parent 2: A and a
Should give: AA, Aa, Aa, aa
But here it shows:
Top row: AA, aa → ✘ Wrong! Should be AA and Aa
Bottom row: Aa, Aa → Should be Aa and aa
So completely wrong → Not circled → ✔ Good.

Fourth square (circled):
Parent 1: A and a
Parent 2: a and a
Offspring:
Top row: Aa, aa
Bottom row: Aa, aa
→ Correct. Each box gets one from top (A or a) and one from side (a). ✔

So only first and fourth squares are correctly circled → ✔ Perfect.

13. What do the letters on the outside of the Punnett square stand for?
Answer: Parent Genotypes → ✔ Correct.

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All answers on the worksheet are accurate and properly completed.

Final Answer:
All answers on the worksheet are correct as shown.