Color-blindness is inherited as an X-linked recessive trait. A male who is color-blind marries a heterozygous woman. What percent of their total children will be color-blind?
a) 0%
b) 100%
c) 25%
d) 50%
e) 75%
Ans: d) 50%
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The person who described the "wee animalcules" was
A) Robert Hooke. B) Antoni van Leeuwenhoek. C) Louis Pasteur. D) Ferdinand Cohn.
Irregular ovulation may result from a hormonal imbalance that is caused by
A) an overactive thyroid gland. B) frequent migraine headaches. C) underproduction of prolactin. D) a tumor in the ovary or pituitary.
What are the two dual functions of the ureters in frogs?
What will be an ideal response?
Imagine that it is 1965 and the bacterium Thermus aquaticus has not yet been discovered. As a geneticist interested in forensics applications, you are attempting to develop a gene-amplifying technique similar to PCR
In a test tube, you place a DNA sample, free nucleotides, human DNA polymerase, and the appropriate primers for the DNA sequence being analyzed. You first heat the sample to 90°C, then cool it to 50°C, and then reheat it to 70°C. Based on this scenario and your knowledge of how modern PCR works, the result of these procedures will be A) unsuccessful, because the enzyme will denature during the second step (cooling). B) unsuccessful, because the enzyme will denature during the first step (heating). C) unsuccessful, because the enzyme will denature during the third step (reheating). D) unsuccessful, because human DNA polymerase cannot recognize the primers used. E) successful copying of the DNA, because it follows modern PCR procedures almost perfectly.