Earth is the warmest it has been for ____ years
a. 12
b. 120
c. 1200
d. 12, 000
e. 12, 000, 000
D
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Why are organisms with an odd number of chromosome sets usually sterile?
A) Almost all gametes will have an unbalanced set of chromosomes. B) Chromosomes will fail to segregate independently during meiosis I. C) Chromosomes will fail to segregate independently during meiosis II. D) Because an odd number of chromosomal sets is present, meiosis will not occur at all.
Mendel kept detailed records of the genetic traits of parent plants and their offspring plants. Among observations, he found that some traits would be expressed, whenever one particular allele was present, and called this allele Select one:
a. homozygous. b. dominant. c. recessive. d. homologous. e. heterozygous.
Birds are most closely related to:
a. reptiles. b. testudines. c. mammals. d. labyrinthodonts. e. terrapins.
Cell lines derived from transformed (cancerous) cells are called __________.
a. continuous cell lines b. primary cell lines c. monolayers d. plaques e. embryonated