In the dihybrid cross Aa Bb × aa bb, what proportion of heterozygotes for both gene pairs is expected among the F1 offspring?
A) 1/4
B) 1/2
C) 3/4
D) All are heterozygotes.
E) None are heterozygotes.
A) 1/4
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In the female, the ____ serves as a TEMPORARY endocrine gland and secretes ____
a. pituitary; luteinizing hormone and follicle-stimulating hormone b. corpus luteum; estrogen and progesterone c. ovaries; estrogen and luteinizing hormone d. endometrium; estrogen and follicle-stimulating hormone e. uterus; luteinizing hormone and follicle-stimulating hormone
The first stage of photosynthesis begins with
a. hydrolysis of water. b. breakdown of ATP. c. excitation of electrons. d. phosphorylation of ADP. e. synthesis of NADPH.
The spinal cord is part of the ________ nervous system
A) somatic B) peripheral C) autonomic D) central
The two strands of DNA are:
a. Parallel and complementary b. Anti-parallel and complementary c. Parallel and identical d. Anti-parallel and identical