Height (tallness) in humans is a polygenic trait. Assume the following: There are four genes that determine height (Aa, Bb, Cc, Dd).
Each dominant allele adds 2 inches of height to an individual.
The height of the recessive individual (aabbccdd) is 5 feet.
What is the height of a person with the genotype AABbccDD?
A. 5 feet; 6 inches
B. 6 feet; 6 inches
C. 5 feet; 8 inches
D. 5 feet; 10 inches
E. 5 feet; 4 inches
Answer: D
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Which structure is also known as the birth canal?
A. uterus B. cervix C. vagina D. ovary E. fallopian tube or oviduct
_____ corrects the genetic defect in an individual with a genetic disorder by _____
a. Enzyme replacement therapy; delivery of a normal gene to affected cells in the body b. PGD; removing affected cells from an early stage embryo c. Gene therapy; PGD d. Gene therapy; delivery of a normal gene to affected cells in the body e. Chorionic villus sampling; constructing karyotypes from affected cells
Which of the following statements about 2,3-BPG is FALSE?
A) 2,3-BPG is produced by red blood cells. B) 2,3-BPG produces a rightward shift in the hemoglobin-oxygen dissociation curve. C) 2,3-BPG increases the affinity of hemoglobin for oxygen. D) 2,3-BPG is an intermediate of glycolysis. E) 2,3-BPG synthesis is inhibited by high levels of oxyhemoglobin.
Suppose that a group of climate scientists claims that they can predict future impacts of global climate change with 98% accuracy. Why should you be skeptical of this claim?
A) They do not have reliable methods to measure this change. B) Their predictions are based on incomplete information about species diversity and interactions of living organisms with each other and with their environments. C) They should be focusing their predictions based only on climate change in the polar regions where the greatest effects of climate change are experienced. D) They have not accounted for abiotic factors that affect global climate change in their predictions.