1. A diploid somatic cell from a pigeon (Columba livia) has a total of 80 chromo
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Question
1. A diploid somatic cell from a pigeon (Columba livia) has a total of 80 chromosomes (2n = 80).
Chickens have the ZZ-ZW chromosomal sex determination. What is the total number of chromosomes present in a single cell during prophase II of meiosis?
a. 80
b. 40
c. 160
d. 120
e. 20
2. In the pigeon example above, what is the total number of chromosomes present in a single cell
during metaphase of mitosis?
a. 120
b. 160
c. 40
d. 20
e. 80
3. ______ refers to when the phenotype of the heterozygote is intermediate to the two homozygotes.
a. Incomplete dominance
b. Epistasis
c. Anticipation
d. Complete dominance
e. Incomplete penetrance
4. In Drosophila, an individual who is XXY and has 2 sets of autosomal chromosomes will be____.
a. male
b. metamale
c. intersex
d. female
e. metafemale
5. What phenomenon best describes a situation when the genotype of the mother determines the
phenotype of the offspring?
a. Genotype x Environment Interaction
b. Anticipation
c. Norm of reaction
d. Epistasis
e. Genetic maternal effects
6. If you want to determine if phenotype counts in your experiment deviate from predicted counts,
which test would you use?
a. Dihybrid cross
b. Epistasis test
c. Test cross
d. Chi-square test
e. Complementation test
7. In ball pythons, coral glow coloration is recessive to wildtype coloration and is Z-linked. If a
wildtype female is crossed to a coral glow male, what proportion of female progeny will have the
coral glow phenotype?
a. 33%
b. 25%
c. 50%
d. 100%
e. 0%
8. Flower color in blue-eyed Marys (Collinsia parviflora) is controlled by two genes. At the
B locus, blue flowers (B) is dominant to magenta (b). At the W locus, colored flowers (W) is
dominant to colorless (w). Plants with the genotype B-W- are blue, bbW- are magenta, and --ww
are colorless. A true-breeding plant with magenta flowers is crossed with a true-breeding plant
with white flowers, producing F1offspring with blue flowers. What is the expected phenotypic ratio for F2 progeny after selfing the F1?
a. 9:7
b. 9:3:3:1
c. 9:3:4
d. 12:3:1
e. 1:1:1:1
9. Two linked genes, (G) and (H), are separated by 20 cM. A man with genotype Gh/gH has
children with a woman who is gh/gh. What is the probability that their first child will be Gh/gh?
a. 0.4
b. 0.2
c. 0.1
d. 0.8
e. 0.5
True of False
10._____ A recessive phenotype can be expressed by some progeny of a monohybrid cross.
11._____ Epistatic genes may result from dominant or recessive alleles.
12._____ At a single locus, a diploid individual may have more than two different alleles.
13. _____ A temperature-sensitive allele is an example of a genotype x environment interaction.
14. _____ All of the genetic material in a eukaryotic cell is found in the nucleus.
15. _____ Sex-limited traits are, by definition, encoded by genes on the sex chromosomes.
16. _____ In some XX-XY species, genes on the X chromosome in females have one-half the
expression level of the same genes in males.
17. _____ Type 1 diabetes shows 53% concordance in monozygotic twins and 11% concordance in dizygotic twins, suggesting that genetic variation has no effect on this trait.
18. _____ A gene can have more than two alleles in a population.
19. _____ Linked genes cannot have recombination frequencies that are higher than 50%.
20. _____ The higher the coefficient of coincidence, the higher the degree of crossover interference
Explanation / Answer
1. b
2.e
3.e
4.d
5.e
6.d
7.d
8.c
9.e
10.true
11.true
12. false
13. true
14.false
15. true
16.false
17. false
18. true
19.true
20. true
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