Biology, Eighth Edition (Raven)

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

Post Test

What phenotypes would you expect to see in the F2 generation of a cross between a white-eyed female and red-eyed male Drosophila melanogaster? (p .238)
A)all males and females red-eyed
B)all males and females white-eyed
C)females 1:1 red: white; males 1:1 red: white
D)females 3:1 red: white; males 1:1 red: white
E)females 1:1 red: white; males 3:1 red: white
In most mammals dosage compensation is achieved by random inactivation of one of the X chromosomes in the somatic cells of females. However, in the marsupials (kangaroos, etc.) activation is non-random, and it is the X chromosome that is inherited from the father (the paternal X) that is preferentially inactivated in all somatic cells of females. What are the consequences of this for X-linked traits in marsupials? (p. 241)
A)Both male and female heterozygotes will be somatic mosaics.
B)Heterozygous females will not be somatic mosaics but will show one phenotype or the other.
C)Heterozygous females will not occur.
D)none of the above
Mitochondria have their own circular chromosome separate from the chromosomes in the nucleus. Inheritance of the genes carried on the mitochondrial chromosome shows what features? (p. 242)
A)The genes are said to be maternally inherited.
B)Only females express these genes.
C)Only males express these genes.
D)Males and females are equally affected.
E)both a and d
The maximum recombination frequency that can ever occur is: (p. 245)
Which of the following statement(s) is/are true about the sickle-cell allele? (p. 250)
A)It occurs in some parts of the world at much higher frequencies than can be due to mutation alone.
B)It is caused by a single point mutation in the a polypeptide of the hemoglobin molecule.
C)It confers some resistance to malaria in the heterozygous state.
D)both a and b
E)both a and c
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