Which of the following statements about sperm is correct?
A) Sperm bearing the Y sex chromosome are faster swimmers.
B) Sperm bearing the X sex chromosome are faster swimmers.
C) Sperm bearing the X and the Y sex chromosomes are equally fast swimmers.
D) Sperm do not swim, they crawl.
A
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What is a major limitation of "nationally representative" survey data? a. Minority groups are typically underrepresented
b. When minority groups are included, it is often from groups that are experiencing significant problems. c. In order to appear representative, researchers often over-include people from minority groups resulting in skewed data. d. Most people in minority groups refuse to participate in research studies.
Gabriella, an average 10-year-old, can probably throw a ball ______ she could when she was 6
the same distance as a little bit farther than twice as far as four times as far as
Adolescents' self-reported rates of risk behavior are correlated with the rates of risk behavior they report for their friends. What can we conclude from this?
a. Friends' risk behavior directly affects one's own risk behavior. b. One's own risk behavior causes risk behavior in his or her friends. c. One's own participation in risk behavior is influenced by his or her friends. d. Adolescents' risk behaviors are associated with their friends' risk behaviors.
At what point does the fetal period begin?
A) When the process of organogenesis is complete B) Immediately after the sex of the child can be determined C) After the dendritic arbor forms around the umbilical cord D) When implantation is complete