Genes/ Punnett Squares Quiz
1. The physical appearance of an organism based on traits
A. Genotype
B. Phenotype
C. Meiosis
D. Genetics
2. The allele combinations
A. genetics
B. mitosis
C. genotype
D. phenotype
3. A heterozygous tall (Tt) plant is crossed at with a short plant (tt). The probability that offspring
plants will be tall is:
A. 25%
B. 50%
C. 75%
D. 100%
4. Organisms that have two different alleles for a particular trait are said to be:
A. Hybrid
B. Homozygous
C. Heterozygous
D. Dominant
5. A heterozygous tall pea plant is crossed with a short plant. Tall (T) is dominant to short (t) plants.
The probability that the offspring plant will be tall is:
A. 75%
B. 25%
C. 50%
D. 100%
6. Brown (B) is dominant over white (b) in foxes. A homozygous brown fox is crossed with a white fox.
The probability that the fox offspring will be white phenotype is ___ and a brown phenotype is ___.
A. 0 and 100
B. 100 and 0
C. 50 and 50
D. 25 and 75
7. In cats, yellow fur is dominant over white fur. A heterozygous cat is mated with a white cat. The
possible genotypes of offspring that could occur would be:
A. YY
B. Yy
C. Yy
D. Yyy
8. Organisms that have two identical alleles (BB or bb) for a particular trait are said to be __________.
A. Homozygous B. Dominant
C. Hybrid
D. Heterozygous
Use the Punnett square below to answer question 9.
9. (A) means no dimples and (a) means dimples. What is the probability the person below would have
no dimples?
A. 75%
B. 65%
C. 25%
D. 50%
10. White fur(b) in guinea pigs is dominated by black fur(B). What will be the probability of a hybrid
offspring in the cross: BB x Bb?
A. 0%
B. 25%
C. 50%
D. 100%
Use the the Punnett square below to answer questions 11 and 12.
11. Both parents in this Punnett square
A. are homozygous dominant
B. are homozygous recessive
C. are heterozygous
D. have blue eyes
12. The genotypic ratio here is
A. 25% blue eye 75 % brown eye
B. BB = 25% Bb = 50% bb = 25%
C. BB= 50 % bb = 50%
D. All brown eye