EBIO 1210 EXAM 3 PRACTICE QUESTIONS WITH ACCURATE
SOLUTIONS
1) A human offspring has ________ of the same genes and ___________ of the
same alleles as his/her mother.
A. half, all
B. all, all
C. half, none
D. all, half
E. none, none -- Correct Answer ✔✔ D. all, half
2) Human skin cells typically have 46 chromosomes. A human skin cell in G2 phase
has ___________ chromosomes, ____________ chromatids, and
______________ DNA molecules.
A. 92 92 46
B. 46 92 92
C. 23 46 46
D. 46 46 46
E. 23 23 23 -- Correct Answer ✔✔ B. 46 92 92
3) When, precisely, in the life cycle of a sexually reproducing organism does the
transition from diploid to haploid occur?
A. Meiosis I
B. Fertilization
C. Meiosis II
D. When crossing over happens
E. Mitosis -- Correct Answer ✔✔ A. Meiosis I
4) When, precisely, in the life cycle of a sexually reproducing organism does the
transition from haploid to diploid occur?
A. Meiosis I
B. Fertilization
, C. Meiosis II
D. When crossing over happens
E. Mitosis -- Correct Answer ✔✔ B. Fertilization
5) The original (ultimate) source of all genetic variation is
A. recombination
B. crossing over
C. mutation
D. independent assortment
E. random fertilization -- Correct Answer ✔✔ C. mutation
6) Which of the following contribute(s) to the variation in offspring produced by
sexual reproduction?
A. Crossing over
B. Mutation
C. Independent assortment
D. Random fertilization
E. All of the above -- Correct Answer ✔✔ E. All of the above
7) If an organism has a diploid number of 6 chromosomes, how many different
combinations of maternal and paternal chromosomes are possible in its gametes?
A. 8
B. 12
C. 3
D. 16
E. 6 -- Correct Answer ✔✔ A. 8
8) Which of the following is consistent with the hypothesis of blending inheritance?
A. Crossing a purple-flowered pea plant with a white-flowered pea plant
produces only purple-flowered offspring
B. Great variability in traits is found within any biological population.
C. Crossing two pea plants with yellow seeds produces some offspring with
green seeds
D. A phenotype from the "P" generation of a heredity experiment disappears in
the "F1" generation then reappears in the "F2" generation
SOLUTIONS
1) A human offspring has ________ of the same genes and ___________ of the
same alleles as his/her mother.
A. half, all
B. all, all
C. half, none
D. all, half
E. none, none -- Correct Answer ✔✔ D. all, half
2) Human skin cells typically have 46 chromosomes. A human skin cell in G2 phase
has ___________ chromosomes, ____________ chromatids, and
______________ DNA molecules.
A. 92 92 46
B. 46 92 92
C. 23 46 46
D. 46 46 46
E. 23 23 23 -- Correct Answer ✔✔ B. 46 92 92
3) When, precisely, in the life cycle of a sexually reproducing organism does the
transition from diploid to haploid occur?
A. Meiosis I
B. Fertilization
C. Meiosis II
D. When crossing over happens
E. Mitosis -- Correct Answer ✔✔ A. Meiosis I
4) When, precisely, in the life cycle of a sexually reproducing organism does the
transition from haploid to diploid occur?
A. Meiosis I
B. Fertilization
, C. Meiosis II
D. When crossing over happens
E. Mitosis -- Correct Answer ✔✔ B. Fertilization
5) The original (ultimate) source of all genetic variation is
A. recombination
B. crossing over
C. mutation
D. independent assortment
E. random fertilization -- Correct Answer ✔✔ C. mutation
6) Which of the following contribute(s) to the variation in offspring produced by
sexual reproduction?
A. Crossing over
B. Mutation
C. Independent assortment
D. Random fertilization
E. All of the above -- Correct Answer ✔✔ E. All of the above
7) If an organism has a diploid number of 6 chromosomes, how many different
combinations of maternal and paternal chromosomes are possible in its gametes?
A. 8
B. 12
C. 3
D. 16
E. 6 -- Correct Answer ✔✔ A. 8
8) Which of the following is consistent with the hypothesis of blending inheritance?
A. Crossing a purple-flowered pea plant with a white-flowered pea plant
produces only purple-flowered offspring
B. Great variability in traits is found within any biological population.
C. Crossing two pea plants with yellow seeds produces some offspring with
green seeds
D. A phenotype from the "P" generation of a heredity experiment disappears in
the "F1" generation then reappears in the "F2" generation
