In a Punnett square,
A. all the possible types of eggs are lined up either horizontally or vertically.
B. all the possible types of sperm are lined up either horizontally or vertically.
C. the results show the offspring's expected genotypes.
D. All of the choices are correct.
E. Only two of the choices are correct.
Answer: D
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Production of urine in the nephron begins with
a. filtration. b. tubular reabsorption. c. tubular secretion. d. tubular modification. e. active reabsorption.
Fossils older than ____ cannot be dated by their 14C content because ____
a. 60,000 years; most of the 14C has decayed by this time b. 12,000 years; half of the 14C has decayed by this time c. 6,000 years; older fossils do not contain carbon d. 2,000 years; most of the 14C has decayed by this time e. 500 years; half of the 14C has decayed by this time
A death rate of 2.1% would represent 21 deaths per ________ individuals in a population per year
A) 100 B) 1,000 C) 10,000 D) 1,000,000
Polypeptides are composed of many
A. amino acids. B. carbohydrates. C. nucleic acids. D. fatty acids.