1. What is an allele?
A. A variation of a gene
B. An X or a Y
C. The different traits a person has for a gene
D. Each different gene in a dihybrid cross
2. Two plants that are both heterozygous for two traits are crossed together to produce offspring in a 9:3:3:1 ratio. What is the genotype for the two plants that are crossed?
A. AaBb
B. AABB
C. aabb
D. AAbb
3. What types of gamete can not be produced from a plant with the genotype AABb?
A. AB
B. Ab
C. aB
4. A plant that is heterozygous for two traits is crossed to a plant that is homozygous recessive for both traits. The heterozygous plant is tall with red flowers. The homozygous plant is short with white flowers. What phenotypic ratios would you expect?
A. 9:3:3:1 tall/red: tall/white: short/red: short white
B. 1:2:1 tall/red: tall/white: short/red
C. 1:1:1:1 tall/red: tall/white: short/red: short white
D. 1:2:2:1 tall/red: tall/white: short/red: short white
5. A person is heterozygous for an autosomal dominant condition. If he has children with someone who is homozygous recessive, which statement is correct?
A. All of their children will be carriers.
B. All their children will have the condition.
C. Half of their children will have the condition.
D. We can’t tell from the information given.
6. Which of the following is not an example of polygenic inheritance?
A. having cystic fibrosis
B. eye color
C. height
D. finger print patterns
7. A man is told he is the father of a child with type O blood. He has type A blood. Based on his blood type, he claims he cannot be the father of the child.
A. This statement is true.
B. This statement is false.
8. The ABO Blood Groups (Blood Types) represent
A. Complete Dominance
B. Incomplete Dominance
C. Codominance
D. Polygenic Inheritance
9. In terms of both ABO blood groups and Rh factor, individuals with type O- blood are considered universal donors. Why is this the case?
A. O- individuals do not produce A, B, or Rh antigen so there is no foreign antigen for others to react with.
B. O- individuals do not produce A, B, or Rh antibodies so there is no foreign antibody for others to react with.
C. O- individuals produce all A, B, and Rh antigens for other people to react with.
D. O- individuals produce all A, B, and Rh antibodies for other people to react with.
10. A woman with type A blood has a child with type B blood. The mother claims her boyfriend is the father of the child. What would the man’s blood type have to be to show he is the father?
A. A
B. B
C. O
D. AB
E. He could be either B or AB and be the father.
11. A mother with blood type O has a child with blood type A. What is the child’s genotype?
A. IA IA
B. IA IB
C. IB IB
D. IA i
E. i i
12. Two pink snapdragons that are heterozygous for the color allele are crossed together. Which of the following is true of their offspring? Snapdragons exhibit incomplete dominance.
A. The genotypic and phenotypic ratios of the offspring will be different.
B. Their offspring will contain three different genotypes and three different phenotypes.
C. Their offspring will contain two different genotypes and three different phenotypes.
D. Their offspring will contain three different genotypes but only two different phenotypes.
13. X-linked conditions are caused by
A. proteins that damage the X chromosome.
B. genes that only females have.
C. genes that only males have.
D. inheritance of an extra X chromosome.
E. genes on the X chromosome.
14. If a man shows the phenotype for an X-linked Dominant trait, all of this daughters will show the phenotype as well.
A. This statement is true.
B. This statement is false.
15. A girl is not colorblind, but her father is. What is the girl’s genotype?
A. XbXb
B. XBXB
C. XBXb
D. XBX?
E. XBY
16. Which of these has never been observed in a live human birth?
A. 45, Y male
B. 46, XY male
C. 46, XX female
D. 47, XXX female
17. Aneuploidy can result when:
A. a translocation occurs between two chromosomes.
B. one pair of homologous chromosomes does not separate during meiosis.
C. a developing gamete is haploid.
D. a haploid sperm fertilizes a diploid egg.
18. A man with trisomy 21 could pass Down syndrome to offspring if he:
A. produces sperm that have two copies of chromosome 21.
B. produces sperm lacking chromosome 21.
C. also has Turner syndrome.
D. is a carrier of a deletion for chromosome 21.
E. none of these since a man cannot pass Down syndrome to offspring.
19. Very few types of aneuploids are seen in newborns because:
A. only a few chromosomes undergo nondisjunction.
B. most types of aneuploids are lethal early in development.
C. most aneuploids do not cause detectable defects.
D. missing chromosomes cause most lethal aneuploids.
20. Assume that three pairs of alleles with no environmental modification control height in humans. In this model, each dominant allele contributes four inches to a base height of four feet. What is the range of heights possible in this population?
A. 0 – 2 feet
B. 4 – 5 feet
C. 3 – 5 feet
D. 4 – 6 feet
21. Which gene below determines “maleness” during fetal development?
A. RYS
B. HPV
C. XYZ
D. SRY
22. It is possible for a fetus to have the karyotype 46 XY and develop as a female.
A. This statement is true
B. This statement is false.
23. Skin color is a multifactorial trait because (choose all that apply)
A. Skin color is based on only two alleles.
B. Multiple genes contribute to skin color.
C. The environment can affect skin color.
D. Skin color is an X-Linked trait.
24. A translocation occurs when
A. A piece of a chromosome is completely deleted
B. A piece of a chromosome is duplicated
C. A piece of a chromosome breaks off and attaches to another chromosome
D. A point mutation occurs that causes a chromosome to be lost
25. Polyploidy (choose all that apply)
A. occurs when there are three copies of a single chromosome in the cell
B. can occur when a haploid sperm fertilizes a diploid egg
C. occurs when extra sets of chromosomes are found in the cell
D. is lethal in humans
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