In meiosis, homologous chromosomes align next to one another during
a)interphase I.
b)metaphase II.
c)prophase I.
d)metaphase I.
e)prophase II.
c)prophase I.
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The main reason why the numbers of black-footed ferrets decreased rapidly is
a. decreased populations of prairie dogs. b. decreased numbers of whitebark pine berries. c. habitat disruptions. d. hunting
Tamryn has a son who has Duchenne muscular dystrophy, which is inherited as an X-linked recessive trait. At a molecular level, the disease is due to lack of the protein dystrophin. Tamryn participates in a study that looks at dystrophin levels in various muscles. The study samples cells from 10 different muscles. The study finds that some cells make dystrophin and some do not. An explanation for this finding is that
A) the mutation is only in some muscle cells. B) Tamryn is making less dystrophin as she gets older. The study should be repeated at different ages. C) the X chromosome that bears the mutation is turned on in some cells but off in others. D) Tamryn does not have a Y chromosome.
During bacterial conjugation, bacterial DNA with different alleles are transferred. Bacteria use a long
tubular structure called a ____ to obtain differing alleles.
a. metabolic pilus b. asexual pilus c. flagellum d. cilia e. sex pilus
The process that accounts for the most changes in the mix of alleles in a gene pool is ____
a. natural selection b. genetic drift c. phenotype variations d. inheritance e. mutations