Which master gene sculpts the details of the body's form?
a. All of the genes in the body control the details of the body's form
b. There is no master genes for body form.
c. Dlx
d. Hox
e. Hoxc6
d
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Some combinations of recessive alleles cause problems so severe that a fetus may cease to develop. Such lethal allele combinations appear to alter Mendelian ratios because
A) carriers do not constitute a progeny class. B) they do not show a 1:2:1 genotypic ratio. C) homozygotes for the lethal allele do not appear as a progeny class. D) homozygotes for the lethal allele pass it on to half their offspring.
What is a potential outcome of drinking alcohol? a. Inflammation of the liver
b. Scarring of liver tissue. c. All are potential outcomes of drinking alcohol. d. Accumulation of fat in body tissues. e. Cirrhosis of liver tissue.
What was the evolutionary advantage of the modification of scales on reptiles to feathers on ancestral birds?
a. The feathers helped retain body heat. b. Feathers provided a better means of expressing mating behavior. c. Feathers provided flight. d. Feathers made birds that evolved early less likely to become prey. e. Feathers provided camouflage for nesting birds.
Ants following a trail to the sugar bowl in your kitchen are doing so because of
A. an innate knowledge of where the sugar can be found. B. a dance done by an ant in the anthill. C. chance alone. D. operant conditioning. E. a pheromone pathway laid down by previous ants.