What do twin and adoption studies indicate about the role of genes in body weight?
A) Genes account for between 50% and 90% of the variation in body weight.
B) Genes account for a moderate 15–20 % of the variation in body weight.
C) Genes only account for 5–10 % of the variation in body weight.
D) Body weight is not influenced by genes.
Answer: A
Rationale: Twin, family, and adoption studies all suggest that genes account for between 50% and 90% of the variation in body weight.
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Data points at the extremes of the distribution have
a. little effect on the variance. b. more effect on the variance than scores at the center of the distribution. c. are undoubtedly incorrect. d. distort the usefulness of the median.
What is one of the most common abnormalities concerning the 23rd pair of chromosomes in males?
A. Klinefelter syndrome B. Down syndrome C. XYY D. fragile X
When do siblings typically become the closest?
a. in early childhood c. in young adulthood b. in adolescence d. in middle and late adulthood
