Roan cattle are the heterozygous hybrids of a cross
between a white individual and a red individual. If a
roan bull were crossed with a red cow, their offspring
would show which of the following ratios?
a. all roan
b. 1 red: 2 roan: 1 white
c. 1 red: 1 white
d. 1 red: 1 roan
e. all red
Answer: d
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The growth rate of a given species of microorganism is dependent on the composition of the medium in which it is grown.
Answer the following statement true (T) or false (F)
In 1986, a nuclear power accident in Chernobyl, USSR (now Ukraine), led to high radiation levels for miles surrounding the plant. The high levels of radiation caused elevated mutation rates in the surviving organisms, and evolutionary biologists have been
studying rodent populations in the Chernobyl area ever since. Based on your understanding of evolutionary mechanisms, which of the following most likely occurred in the rodent populations following the accident? A) Mutations caused major changes in rodent physiology over time. B) Mutation led to increased genetic variation. C) Mutation caused genetic drift and decreased fitness. D) Mutation caused the fixation of new alleles.
Products that limit pH changes are often incorporated into media and are referred to as
A. enzymes. B. bases. C. buffers. D. acids.
Refer to Figure 40-1. Which of the following structures contributes to regulation of body temperature?
a. 3 b. 5 c. 7 d. 10 e. 11