Let’s go through each question one by one.
---
Question 1:
We’re told:
- T = tall (dominant)
- t = short (recessive)
The Punnett square shown has:
Top row (from parent 1):
t and
t
Left column (from parent 2):
t and
t
So all four boxes should be filled with combinations of these alleles.
Looking at the grid:
```
| t | t
----|-----|-----
t | tt | ??
----|-----|-----
t | tt | tt
```
Wait — actually, looking again at the image description in the problem, it says:
> In the punnett square below, what belongs in the missing square
And shows a 2x2 grid where three squares are labeled “tt” and one is blank. The top headers are both “t”, and left side headers are both “t”.
That means every offspring gets a “t” from mom and a “t” from dad → so every box must be
tt.
Therefore, the missing square is also
tt.
✔ Correct answer:
B. tt
---
Question 2:
“What you see, or the physical appearance.”
This is asking for the term that describes observable traits — like eye color, height, hair texture, etc.
In genetics:
-
Genotype = genetic makeup (like BB, Bb, bb)
-
Phenotype = what you can observe (blue eyes, brown hair, tall, etc.)
So the correct term is
phenotype.
✔ Correct answer:
D. Phenotype
---
Question 3:
Punnett Square given:
Parent 1 (top): B and b
Parent 2 (side): B and b
Grid:
```
| B | b
----|-----|-----
B | BB | Bb
----|-----|-----
b | Bb | bb
```
Offspring genotypes:
- BB → homozygous dominant
- Bb → heterozygous (appears twice)
- bb → homozygous recessive
Total offspring: 4
Heterozygous (Bb) appears in 2 out of 4 boxes → 2/4 = 50%
✔ Correct answer:
D. 50%
---
Question 4:
Punnett Square:
Top: A and a
Side: A and a
Grid:
```
| A | a
----|-----|-----
A | AA | Aa
----|-----|-----
a | ?? | aa
```
Missing box is bottom-left: comes from side allele “a” and top allele “A”
So combination is:
a + A = Aa
(Note: order doesn’t matter — Aa is same as aA, but we usually write capital first.)
✔ Correct answer:
Aa
But wait — let’s check the options? Actually, the user didn’t list multiple choice letters for Q4 — just asks “What allele combination should go in the missing box?”
From the grid logic: row header is “a”, column header is “A” → combine them →
Aa
Yes.
---
Now, compiling final answers:
Final Answer:
1. B
2. D
3. D
4. Aa
Parent Tip: Review the logic above to help your child master the concept of punnet squares worksheet.
