Occasionally, chromosomes fail to separate during meiosis, leading to daughter cells that have an abnormal number of chromosomes. This phenomenon is called
A. nondisjunction.
B. epistasis.
C. pleiotropy.
D. chromosome inactivation.
E. crossing over.
Answer: A
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Answer the question by using the accompanying graph. The optimal pH for enzyme 1 is ____
a. 2 b. 3 c. 4 d. 7 e. 8
When comparing gene regulation in prokaryotes to that in eukaryotes, which is better? Justify your
answer.
What will be an ideal response?In a segment of DNA, an A base is changed to a C and the error is copied during replication. Under which circumstances is that change considered a mutation? (Select all that apply.)
A) The change alters the phenotype of the organism's offspring. B) The change results in production of a novel protein. C) The change is in a somatic cell, such as a skin cell. D) The change is in a gene, but has no effect on a gene product or phenotype.
Simple goiter can be prevented by
A. administration of insulin. B. administration of ACTH. C. surgery to remove the thyroid gland. D. increasing intake of iodine in the diet. E. removal of the pituitary.