Crossing over occurs during ______________________
a. prophase I.
b. prophase II.
c. telophase II.
d. metaphase I.
a
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If the groups we recognize as different human races represented genetically isolated populations, we would expect to see (select all that apply):
A. more genetic variation between groups than we see within groups. B. more genetic variation within groups than we see between groups. C. no clear pattern of genetic variationin some regions, we would see more variation within than among groups, and in some regions we would see the opposite. D. a correlation between the amount of genetic variation between groups and the length of time the groups have been isolated from one another. E. None of the above.
Progeria is a genetic condition that causes
a. pattern baldness as early as age twenty. b. socially inappropriate vocal outbursts and muscular twitches. c. a high incidence of cancer with any exposure to sunlight. d. muscular and mental deterioration shortly after puberty. e. premature aging which typically leads to death in the early teens.
The above figure shows areas of referred pain that
indicate an internal organ is damaged. Which letter corresponds to heart damage? a. A b. B c. C d. D e. none of these
______ are produced by leukocytes and fibroblasts. It inhibits virus replication and cell division and increases the action of certain lymphocytes that kill other cells.
A) Cytokines B) Interferons C) Chemokines D) TNF