In mice the allele for colored fur (C) is dominant to
the allele for albinism (c). The allele for normal
behavior (W) is dominant to that for waltzing
movement (w). Give the probable genotypes of the
parents if they produced the offspring listed after the
following crosses:
(a) colored normal x white waltzer produced 10
colored normal, 8 colored waltzers, 2 white
waltzers, 11 white normal
(b) colored normal x white normal produced 35
colored normal, 13 colored waltzers
(c) colored normal x colored normal produced 37
colored normal, 14 colored waltzers, 9 white
normal, and 5 white waltzers What will be an ideal response?
Answer: (a)Cc Ww x cc ww
(b)CC Ww x cc Ww
(c)Cc Ww x Cc Ww
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Which of the following substances is secreted by an endocrine gland?
a. Tears b. Breast milk c. Wax d. Saliva e. Hormones
In skeletal muscle contraction, which of the following is the neurotransmitter released at the axon
terminal to trigger an action potential in the muscle cell?
a. troponin b. Ca2+ c. tropomyosin d. ATP e. acetylcholine
The first sphincter through which food passes is between the ____ and the ____
a. esophagus; stomach b. pharynx; esophagus c. stomach; small intestine d. small intestine; large intestine e. colon; rectum
Infants who are homozygous dominant for achondroplasia
a. are often stillborn. b. grow to be no taller than two feet. c. grow taller than individuals who are heterozygous. d. attain a normal height. e. do not develop arms and legs.