Sex determination in mammals is due to the SRY gene. Which of the following could allow a person with an XX karyotype to develop a male phenotype?
A) the loss of the SRY gene from an autosome
B) translocation of SRY to a X chromosome
C) a person with an extra autosomal chromosome
D) a person with one normal and one shortened (deleted) X
B
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Which one of the following statements is TRUE regarding glial cells?
A) They are located in the matrix of cartilage. B) They transmit nerve impulses from the brain to the internal organs. C) They stimulate the contraction of cardiac muscle. D) They support and protect neurons. E) They produce blood plasma.
In which phase do the following events occur: the chromatin condenses into chromosomes, the nuclear membrane disintegrates, and the centrioles migrate to the poles as spindle fibers are organized?
A) anaphase B) prophase C) interphase D) telophase
Why are conifers and cycads considered gymnosperms?
A. The female gametophyte is not completely enclosed in sporophyte tissue at the time of pollination. B. The ovule forms the seed. C. The fruit is not fleshy. D. The pollen is wind dispersed. E. Pollination and fertilization occur at different times.
California tarweed seeds were able to reach the Hawaiian Islands, and a new species emerged from this isolated population. What concept applies to this example?
A) the founder effect B) hybridization C) punctuated equilibrium D) polyploidy