According to the text, this is the earliest member of the genus Homo to appear in the fossil record.
A) founder effect
B) Homo Habilis
C) Latin binomial
D) Australopithecus Africanus
E) convergent evolution
F) Ardipithecus ramidus
G) Neanderthals
H) chimpanzees
I) Homo erectus
J) astragalus
D) Australopithecus Africanus
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Which of the following is/are obligate intracellular parasites?
A. Chlamydia and Rickettsia B. E. coli and Pseudomonas C. Mycoplasma D. Treponema pallidum
Which group of animals is endothermic?
a. fishes. b. mammals. c. reptiles. d. amphibians.
Males are more often affected by sex-linked traits than females because _____
A) male hormones such as testosterone often alter the effects of mutations on the X chromosome B) female hormones such as estrogen often compensate for the effects of mutations on the X chromosome C) X chromosomes in males generally have more mutations than X chromosomes in females D) males are hemizygous for the X chromosome
In some species, such as Steller sea lions, a sexual polymorphism for longevity is observed, with females liv-ing on average several years longer than males. Use an evolutionary explanation of senescence to explain this polymorphism
a. Males have a higher mutation rate than females. b. Males have higher age-specific fertility at older ages than females. c. Sexual selection imposes a more severe trade-off between fitness and longevity in males than in females. d. Males do not need to live as long as females to attain the same fitness.