In radishes, two incompletely dominant genes control color and shape. Red (R) is dominant over white (r), and heterozygotes are purple. Long (L) is dominant over round (l), and heterozygotes are oval. If a true-breeding long, red radish is crossed with a purple oval radish, give the F1 phenotypes and their percentages.
A. All long red
B. 25% long red, 25% long purple, 25% oval red, 25% oval purple
C. 25% long red, 50% round purple, 25% round white
D. 25% long red, 50% long purple, 25% oval white
E. 25% oval red, 25% oval purple, 50% round purple
Answer: B
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Fitness is a measure of reproductive success. If an individual with genotype BB produces 6 offspring, and a heterozygous individual (Bb) produces 10 offspring, and a third individual with genotype bb produces 5 offspring, what is the fitness value for the individual with BB genotype?
A. 1.0. B. 0.5. C. 0.6. D. 0.4. E. 1.1
As you recall, a single enzyme molecule may catalyze a reaction many times. In signal transduction
pathways, which may utilize several enzymes, the result is _________.
a. amplification of the final product b. denaturation of non-essential proteins c. hydrolysis of signal molecules d. transformational modification of the receptor e. change in cell membrane permeability
Each nucleotide contains
1.a five carbon sugar. 2.an amino group. 3.a sulfur atom. 4.a phosphate group. 5.both a five carbon sugar and a phosphate group.
Mitochondria have their own DNA, which encodes some of the proteins that function within the mitochondria. Explain why the inheritance of mitochondrial DNA is described as "maternal inheritance."
What will be an ideal response?