The structure labeled as 9 in the accompanying figure was produced by:
a. the fertilization of two zygotes.
b. meiosis in the zoosporangium.
c. mitosis in the zoosporangium.
d. mitosis in the resting sporangium.
e. meiosis in the resting sporangium.
e
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Which embryonic cell layer develops into the lining of the gut in most eumetazoans?
a. mesoderm b. epiderm c. mesoglea d. endoderm e. ectoderm
Courtship is often dependent on what?
A. social releasers B. a stimulus/response chain C. an alarm call D. taxis E. size and colors
Mendel accounted for the observation that traits that had disappeared in the F1 generation reappeared in the F2 generation by proposing that _____
A) new mutations were frequently generated in the F2 progeny, "reinventing" traits that had been lost in the F1 B) the mechanism controlling the appearance of traits was different between the F1 and the F2 plants C) traits can be dominant or recessive, and the recessive traits were obscured by the dominant ones in the F1 D) members of the F1 generation had only one allele for each trait, but members of the F2 had two alleles for each trait
How can the analysis of mammalian genomes be used to detect and treat human disease? Check all that apply.A) The genomes of the mammalian relatives of humans are the best targets for discovering new treatments for human diseases.B) Comparing the genomes of bacteria and host is likely to reveal good drug targets to eliminate the bacteria without harming the host.C) A comparison of mouse and human genomes would help reveal functions for previously unidentified human genes.D) A comparison of human and mouse genomes would help observe DNA sequences that evolved prior to the evolution of mammals.
What will be an ideal response?