MULTIPLE CHOICE - 34 multiple choice, 2pts each (choose the best answer)
1. If two alleles at a locus are called Jbrown and Jblue, what’s the phenotype of the heterozygote?
A. Brown
B. Blue
C. Intermediate between brown and blue
D. J
E. There’s no way to know without more information
2. Which one of the following pairings between the subdiscipline of genetics and the phenomenon is
INCORRECT?
A. evolution—population genetics
B. gene regulation—molecular genetics
C. allelic frequency alteration—population genetics
D. arrangement of genes on chromosome—transmission genetics
E. chemical nature of the gene—transmission genetics
3. Consider Mendel’s round and wrinkled peas. If we look in the F1 generation from a cross
between true-breeding Round and Wrinkled P0 plants, what fraction of the progeny will be
Round?
A. 0
B. 1/4
C. 1/2
D. 3/4
E. 1
4. A diploid somatic cell from a rat has a total of 42 chromosomes (2n = 42). As in humans, sex
chromosomes determine sex: XX in females and XY in males. What is the total number of chromosomes in
a polar body cell from a rat?
A. 21
B. 40
C. 41
D. 42
E. 84
5. Spinach, Spinacia oleracea, has a diploid chromosome number of 2n=12. How many
chromosomes are present in an interphase cell in the antenna of a leaf of spinach?
A. 3
B. 6
C. 12
D. 24
E. Depends on whether it’s in G1 or G2 of interphase
, 1
6. In species with ZZ/ZW chromosomal sex determination, the ZW females are the
A. Heterogametic sex
B. Heteroskedastic sex
C. Heteroplasmic sex
D. Heterozygotic sex
E. Heteronormative sex
7. Here is the karyotype of a male shrew, showing the twenty pairs of chromosomes (each has
two chromatids attached to one another at the centromere).
This species has chromosomal sex determination. What mode of chromosomal sex determination is
consistent with this karyotype?
A. XX/XY
B. XX/X0
C. ZZ/ZW
D. ZZ/Z0
E. UV
8. Mendel showed that flower position (side vs. top) and pod shape (inflated vs. constricted)
each behaved as single-locus Mendelian traits. The flower position locus is not linked to the
pod shape locus. When Mendel crossed homozygous side-flower inflated-pod peas to
homozygous top-flower constricted-pod peas, the F1s were 100% side-flower inflated-pod in
phenotype. If Mendel allowed the F1s to self fertilize, what’s the expected frequency of side
flower inflated-pod plants in the F2 generation?
A. 1/16
B. 3/16
C. 1/4
D. 7/16
E. 9/16
9. Your somatic cells have two complete sets of the 23 chromosomes. A cell with only one
complete set of chromosomes is
1. If two alleles at a locus are called Jbrown and Jblue, what’s the phenotype of the heterozygote?
A. Brown
B. Blue
C. Intermediate between brown and blue
D. J
E. There’s no way to know without more information
2. Which one of the following pairings between the subdiscipline of genetics and the phenomenon is
INCORRECT?
A. evolution—population genetics
B. gene regulation—molecular genetics
C. allelic frequency alteration—population genetics
D. arrangement of genes on chromosome—transmission genetics
E. chemical nature of the gene—transmission genetics
3. Consider Mendel’s round and wrinkled peas. If we look in the F1 generation from a cross
between true-breeding Round and Wrinkled P0 plants, what fraction of the progeny will be
Round?
A. 0
B. 1/4
C. 1/2
D. 3/4
E. 1
4. A diploid somatic cell from a rat has a total of 42 chromosomes (2n = 42). As in humans, sex
chromosomes determine sex: XX in females and XY in males. What is the total number of chromosomes in
a polar body cell from a rat?
A. 21
B. 40
C. 41
D. 42
E. 84
5. Spinach, Spinacia oleracea, has a diploid chromosome number of 2n=12. How many
chromosomes are present in an interphase cell in the antenna of a leaf of spinach?
A. 3
B. 6
C. 12
D. 24
E. Depends on whether it’s in G1 or G2 of interphase
, 1
6. In species with ZZ/ZW chromosomal sex determination, the ZW females are the
A. Heterogametic sex
B. Heteroskedastic sex
C. Heteroplasmic sex
D. Heterozygotic sex
E. Heteronormative sex
7. Here is the karyotype of a male shrew, showing the twenty pairs of chromosomes (each has
two chromatids attached to one another at the centromere).
This species has chromosomal sex determination. What mode of chromosomal sex determination is
consistent with this karyotype?
A. XX/XY
B. XX/X0
C. ZZ/ZW
D. ZZ/Z0
E. UV
8. Mendel showed that flower position (side vs. top) and pod shape (inflated vs. constricted)
each behaved as single-locus Mendelian traits. The flower position locus is not linked to the
pod shape locus. When Mendel crossed homozygous side-flower inflated-pod peas to
homozygous top-flower constricted-pod peas, the F1s were 100% side-flower inflated-pod in
phenotype. If Mendel allowed the F1s to self fertilize, what’s the expected frequency of side
flower inflated-pod plants in the F2 generation?
A. 1/16
B. 3/16
C. 1/4
D. 7/16
E. 9/16
9. Your somatic cells have two complete sets of the 23 chromosomes. A cell with only one
complete set of chromosomes is
