Biology, Eighth Edition (Raven)

Chapter 13: Chromosomes, Mapping and the Meiosis—Inheritance Connection

Pre Test

1
Which statement(s) is/are true about X-linked inheritance in Drosophila? (p .239)
A)X-linked traits are only shown in males.
B)A male inherits his X chromosome from his mother.
C)A male inherits his X chromosome from his father.
D)There are many genes carried on the Y chromosome.
E)both a and b
2
In humans presence of a Y chromosome determines maleness. In flies such as Drosophila sex is actually determined by the ratio of X chromosomes to the autosomes . If the diploid set of autosomes is represented as 2A then the ratio in females is XX/2A = 1, and in males it is 0.5. What would be the phenotypic sex of a human or a fly with one X chromosome and no other sex chromosomes, but with a normal set of autosomes? (Note: these individuals are not fertile) (p. 239)
A)human male, fly female
B)both female
C)both intersexes
D)human female, fly male
E)both male
3
Mitochondrial genes are inherited only from the female parent because: (p. 242)
A)after fertilization the mitochondria from the male parent are eliminated.
B)of dosage compensation.
C)males don't have mitochondria.
D)mitochondria come from the egg, there are none in the sperm.
4
Recombination of linked genes is caused by crossing over during prophase of meiosis I. Consider a double heterozygote of the genotype A b//a B. What are the parental and recombinant gametes if there is crossing over? (p. 243)
A)Parental: AB, ab; Recombinant: Ab, aB
B)Parental: Ab, aB; Recombinant: AB, ab
C)all recombinant: Ab, aB
D)all recombinant: AB, ab
E)Parental: AA, BB; Recombinant: AB, ab
5
Nondisjunction can occur in meiosis I (Primary Nondisjunction) if the homologs do not separate, or in meiosis II (Secondary Nondisjunction) if the sister chromatids do not separate. What chromosome compositions could occur in the offspring from a couple where there was normal gamete formation in the female but nondisjunction of the Y chromosome in the male? (p. 250)
A)XX, XO, XY, YY
B)XX, XY, XXX, XYY
C)XX, XYY, XO
D)XX, XYY, XY, XO
E)XO, XYY
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