If meiosis did NOT occur in sexual
reproducing organisms,
a. growth of the zygote would be halted.
b. mitosis would be sufficient.
c. gametes would be haploids.
d. the chromosome number would double
each generation.
e. eggs would be haploid, but sperm would be
diploid.
D
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Phanerochaete chrysosporium
A. is a wood-decay fungus. B. is a lichen that serves as food for reindeer. C. is the cause of lung disease. D. is an hallucinogenic mushroom. E. is a rust that causes oak trees to shed their leaves prematurely.
In fruit flies, brown eyes can be caused by recessive mutant alleles of any one of three genes: pn (prune), bw (brown) or ry (rosy). The pn gene is X-linked, bw is on the second chromosome, and ry is on the third chromosome. One wild-type allele of each of the three genes must be present for eyes to be red (wild type). Suppose that two brown-eyed flies are crossed and their progeny consist of brown-eyed sons and red-eyed daughters. Which mutation is responsible for the brown eyes in the parental female?
A) pn B) bw C) ry D) either bw or ry E) any of the three—pn, bw, or ry
The oval window is indicated by
a. A. b. B. c. D. d. E. e. F.
In the following figure, what does the straight line describe?
a. the resemblance of parents and offspring b. the narrow-sense heritability c. the proportion of the total variance explained by the additive variance d. A and B e. All of the above