In human oogenesis, how many chromosomes does an ovum carry?
A) 22
B) 23
C) 44
D) 46
E) 92
B) 23
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From a human developmental standpoint, what is the significance of Hox genes?
What will be an ideal response?
Mendel accounted for the observation that traits which had disappeared in the F1 generation reappeared in the F2 generation by proposing that
A) new mutations were frequently generated in the F2 progeny, ?reinventing? traits that had been lost in the F1. B) the mechanism controlling the appearance of traits was different between the F1 and the F2 plants. C) traits can be dominant or recessive, and the recessive traits were obscured by the dominant ones in the F1. D) the traits were lost in the F1 due to blending of the parental traits. E) members of the F1 generation had only one allele for each character, but members of the F2 had two alleles for each character
It is thought that the first cells probably arose about _____ years ago.
A. 1.2 billion B. 2 billion C. 500 million D. 3.5 billion E. 6 billion
Which scientist(s) discovered the basis for the
base-pair rule, which stated that the amounts of adenine in all DNA are the same, as are the amounts of cytosine and guanine?
a. Watson and Crick b. Beadles c. Chargaff d. Franklin e. Pauling