How many distinct evolutionary branches exist in the domain Archaea, as revealed by genome sequencing studies?
a. two
b. three
c. four
d. five
e. at least six
ANSWER: d
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Crossing over between the A and B genes in a parental cell containing an AB chromosome and an ab chromosome yields which of the following ratios of parental:recombinant gametes?
A) 100:0 B) 75:25 C) 50:50 D) 25:75 E) The ratio depends on whether the parental cell is male or female.
What was the most significant conclusion that Gregor Mendel drew from his experiments with pea plants?
A) There is considerable genetic variation in garden peas. B) Traits are inherited in discrete units and are not the results of "blending." C) Recessive genes occur more frequently in the F1 generation than do dominant ones. D) Genes are composed of DNA.
A potent neurotoxin that causes paralytic shellfish poisoning in coastal temperate North America is produced by ________.
A. diatoms B. green algae C. dinoflagellates D. red algae
In a population of 10,000 individuals, where 3600 are MM, 1600 are Mm, and 4800 are mm, what are the frequencies of the M alleles and the m alleles?
What will be an ideal response?