Question

1. What is the purpose of a Punnett square?
A. To measure DNA length
B. To predict possible offspring traits
C. To determine blood type
D. To compare species

2. Into how many equal boxes is a simple Punnett square divided?
A. 2
B. 3
C. 4
D. 8

3. What do the letters surrounding each side of a Punnett square represent?
A. Chromosomes
B. Alleles
C. Cells
D. Proteins

4. What type of allele is written with a capital letter?
A. Codominant
B. Recessive
C. Dominant
D. Silent

5. What type of allele is written with a lowercase letter?
A. Dominant
B. Recessive
C. Neutral
D. Mutated

6. If alleles are the same (e.g., GG or gg), the genotype is called…
A. Hybrid
B. Homozygous
C. Heterozygous
D. Codominant

7. If alleles are different (e.g., Gg), the genotype is called…
A. Purebred
B. Dominant
C. Heterozygous
D. Recessive

8. In a Punnett square, what does each small box represent?
A. A phenotype only
B. A possible offspring genotype
C. A mutation
D. A parent’s traits

9. How much probability does each box represent in a 4‑box Punnett square?
A. 10%
B. 25%
C. 50%
D. 75%

10. What must be true for a recessive trait to be expressed?
A. One recessive allele
B. One dominant allele
C. Two recessive alleles
D. Two dominant alleles

11. What is the genotype for a heterozygous dominant trait?
A. gg
B. GG
C. Gg
D. gG only

12. What tool helps predict how alleles combine from parents?
A. Microscope
B. Pedigree chart
C. Punnett square
D. Evolution chart

13. A recessive trait appears only when…
A. The dominant allele is present
B. Both alleles are recessive
C. Alleles are missing
D. Chromosomes break

14. Which term refers to the physical appearance of a trait?
A. Genotype
B. Phenotype
C. Allele
D. Gamete

15. Which term refers to the genetic letters (e.g., GG, Gg)?
A. Phenotype
B. Genotype
C. Chromotype
D. Heredity

16. What do dominant alleles do to recessive alleles?
A. Strengthen them
B. Hide or mask them
C. Remove them
D. Replace them

17. What is the FIRST step in making a Punnett square?
A. Fill in the middle boxes
B. Draw a big circle
C. Draw a square divided into four boxes
D. Color the squares

18. Which side of the Punnett square typically holds the father’s alleles?
A. Bottom
B. Right side
C. Top
D. Diagonal

19. Which side typically holds the mother’s alleles?
A. Top
B. Left side
C. Bottom
D. Background

20. If the father is Gg and the mother is gg, what percentage of offspring will be Gg?
A. 0%
B. 25%
C. 50%
D. 100%

21. If a parent has GG genotype, what type of genotype is it?
A. Heterozygous
B. Homozygous dominant
C. Homozygous recessive
D. Mixed

22. If a parent has gg genotype, what type of genotype is it?
A. Homozygous recessive
B. Heterozygous
C. Homozygous dominant
D. Codominant

23. Which statement about Punnett squares is TRUE?
A. They guarantee the offspring’s traits
B. They show probabilities
C. They show only dominant traits
D. They show DNA sequences

24. When filling in boxes, you combine…
A. Random letters
B. One allele from each parent
C. Dominant genes only
D. Recessive genes only

25. A heterozygous plant is crossed with a homozygous recessive plant. What fraction of offspring show the dominant trait?
A. 0
B. 1/4
C. 1/2
D. All

26. What does Gg represent?
A. Two recessive alleles
B. One dominant + one recessive allele
C. Two dominant alleles
D. A phenotype

27. What type of gene combination is needed for a dominant trait to appear?
A. Only recessive
B. At least one dominant
C. No dominant present
D. No alleles

28. The letters placed inside the boxes represent…
A. Parent genotypes
B. Offspring genotype combinations
C. Mutations
D. Excess DNA

29. What does each parent contribute to the Punnett square?
A. Two full chromosomes
B. One allele for the trait
C. No alleles
D. A mutation

30. What do Punnett squares help scientists and students understand?
A. Evolutionary history
B. Weather patterns
C. Genetic probability
D. Chemical reactions

Answer 1

1. B — To predict possible offspring traits
2. C — 4
3. B — Alleles
4. C — Dominant
5. B — Recessive
6. B — Homozygous
7. C — Heterozygous
8. B — A possible offspring genotype
9. B — 25%
10. C — Two recessive alleles
11. C — Gg
12. C — Punnett square
13. B — Both alleles are recessive
14. B — Phenotype
15. B — Genotype
16. B — Hide or mask them
17. C — Draw a square divided into four boxes
18. C — Top
19. B — Left side
20. C — 50%
21. B — Homozygous dominant
22. A — Homozygous recessive
23. B — They show probabilities
24. B — One allele from each parent
25. C — 1/2
26. B — One dominant + one recessive allele
27. B — At least one dominant
28. B — Offspring genotype combinations
29. B — One allele for the trait
30. C — Genetic probability