There are three alleles controlling the ABO blood types. IA and IB are codominant genes so that the combination IAIB
produces the AB blood type. The third allele, i, is recessive to the other two alleles. Indicate which of these parents could
produce the given child:Parents
Child Yes or No
(a) A ´ AB B
(b) A ´ O A
(c) A ´ B O
(d) A ´ AB O
(e) A ´ AB B
(f) B ´ B O
(g) AB ´ AB A
ANSWER: (a) Yes
(b) Yes
(c) Yes
(d) No
(e) Yes
(f) Yes
(g) Yes
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Class I MHC proteins have grooves with open ends
Indicate whether the statement is true or false.
Some conditions like progeria do not run in families despite being autosomal dominant. How is this possible? What will be an ideal response?
Punctuated equilibrium is:
a. a theory about the pace of evolutionary change in which rapid periods of evolutionary change are punctuated by longer periods with little change. b. a theory about the pace of evolutionary change in which long periods of evolutionary change are punctuated by short periods with rapid change. c. a way of explaining the idea of "evolution by creeps." d. a way of explaining the idea of "evolution by jerks." e. Both the first and fourth choices are correct.
Why can scratching or chipping the seed coat speed up the germination of hard-coated seeds like alfalfa?
A. Bacteria or fungi can enter the seed and release growth factors. B. Carbon dioxide can enter the seed and stimulate photosynthesis. C. The mechanical stress activates hydrolytic enzymes. D. Water and oxygen can enter the seed to reach the embryo more quickly. E. Damage to the seed coat triggers the aleurone layer to release amylase.