1. What information can be revealed by a Punnett square. A
What information can be revealed by a Punnett square? A. gender of parents B. pattern of inheritance in families C. potential genotypes and phenotypes of offspring D. potential chromosomal abnormalities in offspring C

2. Sarah has attached earlobes (recessive allele, b)
Sarah has attached earlobes (recessive allele, b). Her father has free earlobes (dominant allele, B), while her mother has attached earlobes. Which are most likely the genotypes of the family? A. Sarah = Bb Mother = BB Father = Bb B. Sarah = bb Mother = Bb Father = BB C. Sarah = Bb Mother = Bb Father = Bb D. Sarah = bb Mother = bb Father = Bb D

3. If all the offspring of a test cross display a dominant phenotype, which can be determined about the individual? A. The individual’s genotype will be tt. B. The individual’s genotype will be Ttt. C. The individual’s genotype will be TT. D. The individual’s genotype will be TtTt. C

4. Which term best describes an individual who is heterozygous for a recessive trait? A. a carrier B. a genome C. an allele D. an autosome A

5. Two parents both have brown eyes
Two parents both have brown eyes. They have two children, one with brown eyes and one with green eyes. Which explains how this could have occurred? A. Eye color is a homozygous trait controlled by two or more alleles. B. Eye color is a polygenic trait controlled by two or more genes. C. Brown and green eye color are both dominant genes. D. Green eye color is the result of a mutation. B

6. Which is the best example of a polygenic trait. A. blood type B
Which is the best example of a polygenic trait? A. blood type B. face freckles C. hair color D. free or attached earlobes C

7. What is the purpose of a test cross. A
What is the purpose of a test cross? A. to determine if a trait is polygenic B. to determine the sex of an organism C. to determine the genotype of an organism D. to determine the phenotype of an organism C

8. A shorthorn cow has a red and white mixed coat called roan
A shorthorn cow has a red and white mixed coat called roan. There are red hairs, white hairs, and red/white hairs in the coat. What is the genotype for co-dominant roan color? A. RR B. RW C. WW D. rw B

9. Red-green color vision is controlled by an allele located on the X-chromosome. A woman with normal color vision, but whose father is red-green colorblind, marries a man who is red-green colorblind. If a son is born to this couple, what is the probability that he will inherit red-green color blindness? A. 0% B. 25 % C. 50 % D. 100% C

10. What is the genotype of the parent generation mother in the diagram. A
What is the genotype of the parent generation mother in the diagram? A. homozygous dominant B. homozygous recessive C. co-dominant D. heterozygous D

11. If an offspring has a 50% chance of inheriting the recessive trait (aa), which represents the genotypes of its parents? A. Aa and Aa B. Aa and aa C. aa and aa D. AA and AA B

12. How many phenotypes and genotypes are possible from the three alleles (A, B, and O) in human blood? A. 6 phenotypes, 4 genotypes B. 3 phenotypes, 2 genotypes C. 4 phenotypes, 6 genotypes D. 2 phenotypes, 4 genotypes C

13. Duchenne Muscular Dystrophy is a recessive sex-linked condition that is more common in males than in females. Which statement best explains why this is true? A. Males inherit the recessive allele from their fathers. B. Males inherit the recessive allele on the X-chromosome only. C. Males inherit the recessive allele on the Y-chromosome only. D. Males must have two recessive alleles to inherit the condition. B

14. Two chromosomes code for two different genetic traits
Two chromosomes code for two different genetic traits. How does meiosis explain the variety of genotypes in potential offspring? A. During meiosis, both chromosomes pass on two alleles to each of two diploid cells. B. During meiosis, both chromosomes pass on one allele to each of two diploid cells. C. During meiosis, both chromosomes pass on two alleles to each of four haploid cells. D. During meiosis, both chromosomes pass on one allele to each of four haploid cells. D

15. One of the parents of a child has phenylketonuria (PKU), which is caused by recessive alleles. The other parent does not have the PKU alleles. What is the chance that the couple will have a child with phenylketonuria? A. 0% B. 50% C. 75% D. 100% A