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.
Answer: C
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Rabbits were introduced to Australia in the 18th century. There were no other rabbits in Australia and there were no
natural predators for the rabbits. It is likely that their population experienced ____.
a. per capita birth rate b. logistic growth c. exponential growth d. sudden death e. density independence
Which of the following is the best explanation for why vegetable oil is a liquid at room temperature while animal fats are solid?
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Replication of the eukaryotic chromosome is initiated at
A. single site. B. two sites. C. 10 sites. D. multiple sites.
Short hair (L) is dominant to long hair (l). If a short-haired animal of unknown origin is crossed with a long-haired animal and they produce one long-haired and one short-haired offspring, the results would indicate that