The so-called robust australopithecines are:a

the earliest members of the genus Australopithecus.
b. the line that gave rise to the genus Homo.
c. the hominids that developed from Ardipithecus.
d. a dead-end branch in hominid evolution.
e. an extinct line of hominoids that existed about 6?7 million years ago.


D

Biology & Microbiology

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Which of the following describes when a species that is not divided by any geographic barrier evolves into separate species within the same location?

a. gene flow b. founder effect c. sympatric speciation d. allopatric speciation

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Body cells of human males contain _____

a. one X chromosome b. two X chromosomes c. one Y chromosomes d. two Y chromosomes e. one X and one Y chromosome

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Recessive disorders related to genes found on the X chromosome but not on the Y are more commonly expressed in ________

A) children B) adults C) females D) males

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Which graph in Figure 7.3 best depicts the effect of placing the culture in an autoclave for 15 min. at time x?

A) a
B) b
C) c
D) d
E) e

Biology & Microbiology