Which of the following correctly orders the sequence in which genes controlling the development of the anterior-posterior axis of Drosophila larvae are expressed?
A. maternal-effect genes, gap genes, pairrule
genes, segment-polarity genes
B. maternal-effect genes, gap genes,
segment-polarity genes, pair-rule genes
C. pair-rule genes, maternal-effect genes,
segment-polarity genes, gap genes
D. maternal-effect genes, segment-polarity
genes, pair-rule genes, gap genes
E. gap genes, pair-rule genes, segmentpolarity
genes, maternal-effect genes
A
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During days 8 and 9 after fertilization in humans, ____
a. amnion cleavage begins b. a blastocyst forms c. an embryonic disk is formed d. implantation occurs e. gastrulation occurs
Not much physical evidence of life is available from rocks of the Precambrian because these ancientrocks:a
have been greatly eroded in most areas. b. have been deeply buried in most areas. c. have been deposited in oceanic trenches deep in the oceans. d. occupy inaccessible areas of mountainous regions. e. occupy the polar regions and are thus covered by glaciers
There are many kinds of animals in which males have characteristics that are clearly disadvantageous to them. Which of the following statements offers the best explanation for the retention of these disadvantageous characteristics?
A. Natural selection has not gotten around to eliminating them yet. B. Females may select males with the disadvantageous characteristics as mates over those males that lack the characteristics. C. Males may be strong enough to overcome these characteristics. D. The characteristic is probably an acquired characteristic.