Homologous chromosomes undergo recombination during ____
a. prophase II
b. metaphase I
c. metaphase II
d. both prophase I and II
e. prophase I
ANSWER: e
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In standardized DNA fingerprinting used in the United States,
a. 13 different noncoding loci are examined. b. 13 different coding loci are examined. c. only loci with short tandem repeats are tested; the number varies with individuals. d. the loci with long tandem repeats are tested; the number varies with individuals. e. the sequence of short tandem repeats is determined.
Autopolyploids contain __________ the number of
parental chromosomes and are usually artificially produced through the application of __________. a. triple; colchicine b. double; heat c. double; colchicine d. triple; heat e. double; radiation
water cycle picture
What will be an ideal response?
Assume that you are told that a particular organism, Drosophila, has the XO chromosome complement. You are also told that the autosomal complement is a normal 2n. You know that in humans the XO complement is female determining. Would you be correct in
assuming that the Drosophila sex for XO is also female? Choose the answer that includes the correct explanation. A) Yes, the presence of an X chromosome determines a female in both organisms. B) Yes, because sex determination in humans and insects is essentially the same. C) No, the chromosomal basis for sex determination in Drosophila is based on the balance between the number of X chromosomes and haploid sets of autosomes. D) No, it takes two X chromosomes to produce a female in humans and a Y chromosome to produce a male in Drosophila. E) No, sex determination in Drosophila is dependent on the presence or absence of the Y chromosome.