The position of gonads varies in different animal groups. An octopus has gonads _____.
A. on the back of its head
B. at the ends of its arms
C. in the abdominal cavity
D. in the coelom
E. on its penis
Answer: A
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An allele that expresses its phenotype even when heterozygous with a recessive allele is termed
A) recessive. B) recombinant. C) dominant. D) parental. E) independent.
Nondisjunction results in
A. two small daughter cells that disappear and two normal-sized cells. B. two polar bodies. C. daughter cells with different numbers of chromosomes. D. two cells with equal numbers of chromosomes.
Earth's ozone layer is extremely important because it
A) traps harmful infrared rays. B) blocks incoming UV radiation, which is damaging to animals and reduces photosynthesis in plants and algae. C) blocks incoming visible light to protect Earth against the greenhouse effect. D) maintains high carbon dioxide concentrations so that photosynthesis can occur. E) traps heat so that Earth's temperature does not fall too much.
Which of the following is not involved in the regulation of the reproductive system?
A. hypothalamus B. testes/ovaries C. anterior pituitary D. adrenal gland E. nervous system