In certain plants, tall is dominant to short. If a heterozygous plant is crossed with a homozygous tall plant, what is the probability that the offspring will be short?
A) 1
B) 1/2
C) 1/4
D) 1/6
E) 0
Answer: E
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Which curves on the graphs may represent the temperature and pH profiles of an enzyme taken from a bacterium that lives in a mildly alkaline hot springs at temperatures of 70 °C or higher?
A) curves 1 and 5 B) curves 2 and 4 C) curves 2 and 5 D) curves 3 and 4 E) curves 3 and 5
The oldest fossil remains of Homo sapiens found so far date from about _____
A) 6 million years ago B) 1.6 million years ago C) 195,000 years ago D) 60,000 years ago E) 16,000 years ago
Two characters that appear in a 9:3:3:1 ratio in the F2 generation should have which of the following properties?
A) Each of the traits is controlled by single genes. B) The genes controlling the characters obey the law of independent assortment. C) Each of the genes controlling the characters has two alleles. D) Four genes are involved. E) Sixteen different phenotypes are possible.
Lancelets live in
A) deserts. B) treetops. C) sulfur springs. D) fresh water. E) the sea.