Males of the fly species Drosophila bifurca are only a few millimeters in length, yet they hold the world record for sperm length, with sperm being 50mm long
Males produce only ca. 100 sperm over the course of their lives, as such large sperm are very costly to produce. One hypothesis to explain such large sperm size is postcop-ulatory sperm competition. Which of the following are reasonable approaches to test this hypothesis?
a. test whether the order in which multiple males mated with the same female correlates to the number of offspring sired by each male
b. examine the physical location of male sperm in the female reproductive or-gans via microscopy
c. document fertilization success in crosses between a single male and a single female
d. test whether the degree of sperm competition in related Drosophila species correlates with sperm size
e. A, B, and D
E
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A) differential culture. B) selective culture. C) enrichment culture. D) sensitive culture.
The two amino acids in the accompanying figure both have side groups (R groups) that are ____
a. acidic and polar b. uncharged and nonpolar c. basic and polar d. acidic and nonpolar e. uncharged and polar
The earliest fish are represented today by:
a. hagfish. b. lamprey. c. sharks. d. both a and b. e. both b and c.
Polyploidy means having
A. an abnormal number of two or more individual chromosomes. B. three or more sets of chromosomes. C. only one set of chromosomes. D. three or more chromosomes. E. an abnormal number of one particular chromosome.