Answer the question using the accompanying figure. Which image represents the position of the Earth during the
vernal (March) equinox?
a. a
b. b
c. c
d. d
e. A and C
ANSWER: b
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Transcription of DNA
(a) results in formation of a complementary strand of RNA. (b) produces two new strands of DNA. (c) occurs on the surface of the ribosome. (d) is semiconservative.
In a dihybrid cross AA BB × aa bb, what proportion of heterozygotes for both gene pairs is expected among the F2 offspring?
A) 1/4 B) 1/2 C) 3/4 D) All are heterozygotes. E) None are heterozygotes.
The hormone oxytocin affects __________ in many
mammals. a. labor and delivery b. lactation c. pair bonding d. maternal behavior e. all of these
Which of the following statements is false?
a. Crossing over tends to reduce the frequency that two linked genes are inherited together. b. Independent assortment of homologous chromosomes during meiosis increases variation. c. Crossing over leads to variation. d. An abnormal number or structure of chromosomes may influence the course of evolution. e. The closer together genes are found on a chromosome, the greater the chance that crossing over will occur between them.