Select the best definition of contraceptives.
Answer: Medications and devices that reduce the chance of pregnancy
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Current thinking about the cause of Hutchinson-Gilford syndrome, which is a severe rapid aging condition, is that
A) the body is unable to secrete insulin. B) the part of the brain that controls aging is damaged. C) abnormal lamin A protein stresses the nuclear membrane, disturbing DNA repair such that mutations accumulate that cause the diseases of aging. D) a protein called progerin forms clumps in the brain in a way that removes DNA from the tips of telomeres, shortening chromosomes and lifespan.
What type of DNA map gives locations and sizes of DNA sections?
A. Chromosomal B. Sequence C. Physical D. Linkage E. Geographical
Mendel's law of segregation indicates that
A. gametes have one allele copy for each gene B. more gametes carrying the dominant allele are produced than gametes carrying the recessive allele C. gametes are diploid D. two alleles segregate into each gamete.
Sperm pass through several stages during their development. What is the earliest stage in which the cell becomes haploid?
a. sperm b. secondary spermatocyte c. spermatogonium d. spermatid