If you are studying the physical forms that organisms take, you are studying:
A) vestigial characters. B) morphology.
C) comparative embryology. D) polygenic inheritance.
Answer: B
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Identical twins can result from ____
a. the fusion of two sets of identical gametes b. a division of a zygote into two separate cells that develop into two separate embryos c. the fusion of two paternal gametes with a single maternal gamete that then divides d. a lack of chromosomal separation during meiosis resulting in gametes that are diploid e. a mechanism that is not understood
Peter Sheldon found that the number of tail “ribs” in ____ changed over a 3 million year period with no evidence of
speciation.
a. horses b. trilobites c. insects d. humans e. ectoprocts
Altruism in animals
a. lowers their chances of perpetuating their own genes. b. has no genetic basis. c. is a conscious effort to preserve the species. d. is just lucky behavior. e. includes none of these
Which portion of the testes produces sperm?
a. Leydig cells b. interstitial cells c. epididymis d. seminiferous tubules e. Sertoli cells