128 Review Questions
4. X-linked recessive traits in humans (or in Drosophila) are observed ________.
- in more males than females
- in more females than males
- in males and females equally
- in different distributions depending on the trait
5. The first suggestion that chromosomes may physically exchange segments came from the microscopic identification of ________.
- synapsis
- sister chromatids
- chiasmata
- alleles
6. Which recombination frequency corresponds to independent assortment and the absence of linkage?
- 0
- 0.25
- 0.50
- 0.75
7. Which recombination frequency corresponds to perfect linkage and violates the law of independent assortment?
- 0
- 0.25
- 0.50
- 0.75
8. Which of the following codes describes position 12 on the long arm of chromosome 13?
- 13p12
- 13q12
- 12p13
- 12q13
9. In agriculture, polyploid crops (like coffee, strawberries, or bananas) tend to produce ________.
- more uniformity
- more variety
- larger yields
- smaller yields
10. The genotype XXY corresponds to
- Klinefelter syndrome
- Turner syndrome
- Triplo-X
- Jacob syndrome
11. Abnormalities in the number of X chromosomes tend to have milder phenotypic effects than the same abnormalities in autosomes because of ________.
- deletions
- nonhomologous recombination
- synapsis
- X inactivation
12. By definition, a pericentric inversion includes the ________.
- centromere
- chiasma
- telomere
- synapse