Approximately how many years ago did humans of the genus Homo first inhabit eastern Africa?
a. 6 million
b. 4 million
c. 3 million
d. 2 million
e. 1 million
D
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A seedling plant has a section of the stem tip that contains large numbers of cells undergoing mitosis for the purpose of
A. sexual reproduction of gametes, to produce new offspring. B. fertilization of the gametes in order to produce new offspring. C. growth in height of the plant. D. asexual reproduction of gametes, to produce new offspring. E. replication of the DNA in the stem, where new flowers will go through meiosis.
What keeps the two populations separate?
A) temporal reproductive isolation B) lack of hybrid viability C) behavioral reproductive isolation D) habitat isolation
Cancer ranks as the number __ cause of mortality in the U.S.
a. 1 b. 2 c. 3 d. 4
The alleles of a gene are found at ________ chromosomes
A) the same locus on nonhomologous B) different loci on homologous C) different loci on nonhomologous D) the same locus on homologous