Examining Punnett squares to identify correct genetic crosses.

Let’s solve this step by step.

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Part 1: Match the definitions with the terms

We’ll go one by one:

1. genotypes made of the same alleles
→ That means both alleles are identical, like AA or aa.
That’s called homozygous.
So, match #1 → D

2. different forms of genes for a single trait
→ These are the different versions of a gene — like “A” and “a”.
Those are called alleles.
So, match #2 → A

3. gene that is always expressed
→ This is the one that shows up even if there’s only one copy.
That’s the dominant gene.
So, match #3 → B

4. gene that is expressed only in the homozygous state
→ This one only shows up when you have two copies (like aa).
That’s the recessive gene.
So, match #4 → E

5. genotypes made of two different alleles
→ Like Aa — one dominant, one recessive.
That’s called heterozygous.
So, match #5 → C

✔ So the matches are:
1 → D
2 → A
3 → B
4 → E
5 → C

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Part 2: Examine the Punnett squares and circle those that are correct

Remember: In a Punnett square, you put one parent’s alleles on top, the other on the side. Then each box gets one allele from the top and one from the side.

Let’s check each one:

First square:
Top: D, d
Side: d, d

Boxes:
- Top-left: D + d = Dd ✔
- Top-right: d + d = dd ✔
- Bottom-left: D + d = Dd ✔
- Bottom-right: d + d = dd ✔
→ All correct! ✔️

Second square:
Top: D, D
Side: d, d

Boxes:
- Top-left: D + d = Dd ✔
- Top-right: D + d = Dd ✘ but it says DD → WRONG
Wait — let’s look again:

Actually, the square shows:
Top row: Dd | DD
Bottom row: Dd | Dd

But if top is D,D and side is d,d, then every child should be Dd.

So:
- Top-left: D + d = Dd ✔
- Top-right: D + d = Dd ✘ but written as DD → ERROR
- Bottom-left: D + d = Dd ✔
- Bottom-right: D + d = Dd ✔

One box is wrong → So this square is incorrect ✖️

Third square:
Top: A, a
Side: A, a

Boxes:
- Top-left: A + A = AA ✔
- Top-right: a + A = Aa ✘ but written as aa → ERROR
Wait — actually, looking at the image:

It says:
Top row: AA | aa
Bottom row: Aa | Aa

But if top is A,a and side is A,a, then:

- Top-left: A (from top) + A (from side) = AA ✔
- Top-right: a (from top) + A (from side) = Aa ✘ but written as aa → WRONG
- Bottom-left: A (from top) + a (from side) = Aa ✔
- Bottom-right: a (from top) + a (from side) = aa ✘ but written as Aa → WRONG

Multiple errors → Incorrect ✖️

Fourth square:
Top: A, a
Side: a, a

Boxes:
- Top-left: A + a = Aa ✔
- Top-right: a + a = aa ✔
- Bottom-left: A + a = Aa ✔
- Bottom-right: a + a = aa ✔
→ All correct! ✔️

✔ So correct Punnett squares are: First and Fourth.

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Final Answer:

Part 1 Matching:
1 → D
2 → A
3 → B
4 → E
5 → C

Part 2 Correct Punnett Squares:
First square and Fourth square