A 2001 fossil find called Orrorin tugenensis, dated 6 million years of age,
A. appears to have been a chimp-sized creature that climbed easily and walked on two legs when on the ground.
B. lacks any possible evidence that it was bipedal.
C. is the undisputed "missing link."
D. was found in South America, suggesting that the transition into bipedalism may have happened there.
E. is older than the famous Toumai find.
Answer: A
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Which of the following statements about natural selection is NOT true?
A. Natural selection operates directly on genetic variety. B. Natural selection is the sum of environmental forces that conditions the survival of particular phenotypes. C. Natural selection operates with respect to specific environments. D. Natural selection is most obvious when there is competition among a population for strategic resources. E. Natural selection was first scientifically described by Darwin and Wallace.
In environments where organisms are stressed by heat, mammals tend to have which of the following?
A. an increased body mass and decreased body surface area
B. a decreased body mass relative to body surface area
C. an increased body mass and increased body surface area
D. a decreased body mass and increased body surface area
Cite evidence confirming or denying the universality of the nuclear family. Give examples from different cultures. What other social units might assume the functions associated with nuclear families?
What will be an ideal response?
Sex-linked traits
a. have their loci on all chromosomes. b. are expressed more often in females than in males. c. are expressed in females in the same fashion as autosomal traits. d. are carried mainly on the Y chromosome. e. includes albinism.