The X and Y chromosomes which determine the gender of an individual are known as the ________ chromosomes.
Fill in the blank(s) with the appropriate word(s).
sex
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In pea plants flowers are either white or purple; the purple color is produced by pigments called anthocyanins. The production of anthocyanins is a two-step process; the first is controlled by the C gene and the second by the P gene
Both genes must produce functional proteins for anthocyanin to be produced. For each gene, the dominant (C and P) alleles produce functional proteins. Which of the following genotypes will produce white (no pigment) flowers? A. ccPP B. CcPP C. CCpp D. ccPP and CcPP E. ccPP and CCpp
Crossing over
a. generally results in binary fission. b. involves centrioles. c. involves breakages and exchanges between sister chromatids. d. results in new combinations of alleles being channeled into the daughter cells. e. does all of these.
Which of the following statements concerning the
peripheral nervous system is false? a. Spinal nerves lead to and from the spinal cord. b. There are 31 pairs of spinal nerves. c. Cranial nerves connect directly to the brain d. Peripheral nerves include axons from numerous neurons. e. All spinal nerves carry only motor fibers.
Constipation can result from the consumption of a substance that _____
A) promotes water reabsorption in the large intestine B) speeds up movement of material in the large intestine C) decreases water reabsorption in the small intestine D) stimulates peristalsis