10 Jun If a woman is a carrier for the X-linked recessive colorblindness
Question
21. If a woman is a carrier for the X-linked recessive colorblindness and her husband is normal, what are their chances that a son will be colorblind?
Select one:
a. 25%, since the mother is a carrier
b. 100% because the mother has the gene
c. 50%, since the mother is a carrier
d. None, since the father is normal
e. None, since he will be also a carrier
22.Which of the following steps must be taken in order to manually cross-fertilize two pea plants?
Select one:
a. transfer pollen from one plant to the other
b. transfer a pea from one plant to the other
c. transfer the egg from one plant to the other
d. transfer the stigma from one plant to the other
e. transfer the ovule from one plant to the other
23.How do you correctly write the change in chromosome number that occurs during meiosis?
Select one:
a. “3n to 2n”
b. “2n to n”
c. “3n to n”
d. “4n to 3n”
e. “4n to 2n”
24.What are the resulting chromosomes which separate after metaphase?
Select one:
a. sibling chromosomes
b. daughter chromosomes
c. artificial chromosomes
d. homologous chromosomes
e. copied chromosomes
25.Which of the following occurs during anaphase I?
Select one:
a. Sister chromatids separate
b. Chromosomes condense
c. Homologous chromosomes separate
d. The nuclear membrane disappears
e. Recombination occurs
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