The underlying phenomenon that makes selective breeding or artificial selection possible is genetic variation. It is possible to have phenotypic variation in natural populations because of....
A. artificial selection.
B. gene inversion.
C. differences in alleles for a specific trait.
D. similarity in alleles for a specific trait.
E. both artificial selection and gene inversion.
C. differences in alleles for a specific trait.
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Each day, a bean plant holds its leaves horizontally during the day but folds them close to its stem at night. This is an example of:
a. photoperiodism b. vernalization c. circadian rhythm d. phytochromatic pattern e. systemic acquired rhythm
The brain and spinal cord are covered by the protective:
a. ventricles b. meninges c. cerebrospinal sheaths d. myelin e. endothelium
Viruses always lack which of the following?
A. organelles B. an envelope C. a protein coat D. genetic material E. None of the answer choices is correct.
True-breeding yellow guinea pigs crossed with true-breeding white ones produce only cream-colored offspring. This
pattern indicates incomplete dominance. Rough hair is found to be dominant to smooth hair. Give the F1 and F2 genotypic and phenotypic ratios of a cross of a smooth, white guinea pig with a homozygous, rough, yellow guinea pig. What will be an ideal response?