Lesson: Chapter - 7

Mendelian and Molecular Genetics:Review Questions

1. During which meiotic phase are sister chromatids separated?
(A) Prophase I
(B) Metaphase I
(C) Metaphase II
(D) Anaphase I
(E) Anaphase II
2. One cell that undergoes meiosis will yield how many independent cells?
(A) 1
(B) 2
(C) 3
(D) 4
(E) 5
3. In which generation of a monohybrid cross do all the individuals look the same?
(A) Parental
(B) F1
(C) F2
(D) F3
(E) F4
4. In a monohybrid cross, the two parental genotypes are AA and aa. The genotype of all F1 plants is Aa. If the F1 plants are crossed to get an F1 generation, what percentage of the F2 generation will have the dominant phenotype?
(A) 0%
(B) 25%
(C) 50%
(D) 75%
(E) 100%
5. You are performing a dihybrid cross with two traits encoded by two different genes. These genes are on two different chromosomes and follow the law of independent assortment. The two parental genotypes are AABB and aabb. The genotype of all F1 plants is AaBb. What phenotype ratio will you observe in the F2 generation?
(A) 8:4:2:1
(B) 1:1:1:1
(C) 4:2:2:1
(D) 1:2:2:1
(E) 9:3:3:1
6. A scientist is studying the inheritance of two traits: stem height and stem color. Tall is dominant over short; brown is dominant over green. The scientist wants to do a test cross to determine the genotype of a tall, brown F1 hybrid individual. What will be the height and color of the other plant he uses in this test cross?
(A) Tall and brown
(B) Tall and green
(C) Short and brown
(D) Short and green
(E) It doesn’t matter; any of the above will work.
7. You are studying the inheritance of stem height and stem color. For height, the tall phenotype is dominant over short; for color, the brown phenotype is dominant over green. You mate a purebred tall, brown plant to a purebred short, green plant and all of the F1 offspring are tall and brown. You then mate two of these F1 hybrid offspring together, and you count the following phenotypes in their F2 offspring: 61 tall and brown, 1 tall and green, 2 short and brown, and 18 short and green. Which of the following is probably true?
(A) The two genes controlling these traits are sex linked.
(B) The two genes controlling these traits might be on different chromosomes.
(C) The two genes controlling these traits are linked with no crossing over.
(D) The two genes controlling these traits are nearby on the same chromosome.
(E) The two genes controlling these traits are far apart on the same chromosome.
8. Which of the following is usually NOT true of an autosomal recessive disease?
(A) Most people with the disease have parents who do not have the disease.
(B) An equal number of males and females get the disease.
(C) If both parents have the disease, 50% of their offspring will have the disease.
(D) If both parents are heterozygous, 75% of their children will not get the disease.
(E) The genes for the disease are not located on the sex chromosomes.
9. A woman who is a heterozygous carrier of the hemophilia allele marries a man who has hemophilia. What percentage of their female children would you expect to have hemophilia?
(A) 0%
(B) 25%
(C) 50%
(D) 75%
(E) 100%
10. A boy with red-green color blindness (an X-linked recessive condition) has a color-blind father and a mother who is not color blind. From which parent did the boy inherit his color blindness?
(A) No way to know—it could have been either one.
(B) His father
(C) His mother
(D) It had to come partly from both his mother and father.
(E) It had nothing to do with either his mother or father.
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