The role of environmental factors on gene expression is illustrated by ____.
A. the varying plant height of genetically identical yarrow plants when grown at different elevations
B. the flower color of hydrangeas
C. the coloration in snapdragon plants
D. male-pattern baldness
E. genetic variety in eye color
Answer: A
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Transposons are frequently used as cloning vectors.
Answer the following statement true (T) or false (F)
Which of the following statements correctly describes a quantitative trait?
A. People who are homozygous for the group of genes associated with skin pigment have either lighter or darker skin than those who are heterozygous for those genes. B. The alleles of the gene for red hair color is masked by the gene for brown hair color. C. A person heterozygous for dwarfism will always have the dwarf phenotype. D. A woman who has one allele for color blindness will not be color blind, but a man who has one allele for color blindness will be color blind. E. 25% of the offspring from a cross of two fruit flies that are heterozygous for curly wings will have curly wings.
Mice lacking plakoglobin have skin defects but usually die from
A) cancer. B) muscular dystrophy. C) heart failure. D) Ehlers–Danlos syndrome. E) scurvy.
Cladograms show the sequence of evolution of characters in a clade.
a. true b. false