A child is born with dwarfism (tt). His parents are of normal height. Which of the following must be TRUE of the parents?
A) They are both homozygous dominant tall. B) They are both heterozygous dwarf.
C) They are both homozygous recessive dwarf. D) They are both heterozygous tall.
D
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If a pedigree of several generations shows only females affected by a particular trait, what can be ruled
out? A. Autosomal recessive inheritance D. X-linked recessive inheritance B. X-linked dominant inheritance E. None of these can be ruled out C. Y-linked inheritance
Which organelle is most abundant in cardiac muscle cells?
A) Golgi complexes B) Plastids C) Lysosomes D) Mitochondria E) Smooth ER
Which molecule contains a binding site for the attachment of myosin heads?
A) Myoglobin B) Tropomyosin C) Actin D) Troponin
After estimating a probit model for the likelihood of a website visitor clicking through conditional on if the visit occurred on a weekday or not, you get the following results: ClickThroughi = -1.2(0.4) + 0.8(0.2)WeekDayi, where standard errors are reported in parenthesis. What would be the calculation that yields the marginal effect of a visit moving from a weekend to a weekday on click-throughs?
A. ?(-1.2 + 0.8) - ?(-1.2) B. -1.2 + 0.8 = -0.4 C. ?(-1.2) D. 0.8