Why might traits such as skin color be fairly consistent within a racial group, but alleles for skin color aren't consistent?
A) There's no relationship between alleles and skin color.
B) Skin color is influenced by many genes, so several different gene pools can produce the same skin color.
C) Only one gene is important in skin color, and when analysis is limited to that gene, there's clear evidence of a long separation of groups.
D) Few allele variations between groups are just what you would expect if races were genealogical species.
B
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a. the nucleus b. chromoplasts c. rough endoplasmic reticulum d. the central vacuole e. chloroplasts
A type of horizontal gene transfer in prokaryotes, in which a cell takes up naked DNA without cell-to-cell contact, is
A. transduction. B. fixation. C. conjugation. D. transformation. E. replication.
In mammals, which of the following substances is produced in a muscle that operates anaerobically?
(A) Citrate (B) NADPH (C) Lactate (D) Oxygen
Early in the 1900s, Svante Arrhenius proposed the concept of
A. panspermia. B. spontaneous generation. C. autotroph theory. D. endosymbiosis.