A somatic cell divides to form two genetically identical daughter cells during mitosis. Prior to mitosis, what must
occur?
a. The cell must replicate its DNA.
b. The cell must first be fertilized.
c. The nucleus must divide.
d. Chromatids must be separated.
e. The nuclear envelope must disintegrate.
ANSWER: a
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What do you conclude from this information?
You discover a gene that results in a complete lack of hair in rats, and you name the gene "chromedome." A cross of homozygous normal and homozygous bald rats results in all bald rats. You conclude that the baldness allele is dominant, but when you repeat the cross with different rats none of the offspring are bald. Extremely puzzled you study your records and discover that in the first cross the bald rat was female, while in the second cross the bald rat was male. A. Chromedome is imprinted in females. B. Chromedome is imprinted in males. C. Chromedome is dominant in males and recessive in females. D. Chromedome is dominant in males and recessive in females. E. Chromedome is an X-linked gene.
Where are the adrenal glands located?
a. beneath the pituitary gland b. between the pons and the medulla oblongata c. next to the pancreas d. on top of the kidneys e. attached to the liver
Incest avoidance evolved in humans:
a. because breeding among close relatives leads to a higher proportion of offspring with genetic defects and, consequently, reduced fitness. b. as part of a larger fixed action pattern. c. because many bees, wasps, and ants can inflict painful, and even fatal, stings and bites. d. because in early human societies, alliances could be achieved by marrying the chief's daughter to the son of the chief of a different tribe. e. because breeding among close relatives leads to a higher proportion of offspring with increased fitness.
The Kissimmee River Restoration Project is intended to
A) drain natural wetlands in the central Florida region. B) increase biodiversity of the region. C) restrict ecotourism and other recreational usage in the impacted region. D) provide areas for homes and businesses.