When alleles on a pair of homologous chromosomes move into different gametes during meiosis, this demonstrates
A) segregation.
B) crossing over.
C) dominance.
D) recessive inheritance.
E) fertilization.
A
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Among the mammals, only some primates (including most humans) have color vision. What was the likely advantage that probably drove the evolution of primate color vision?
A. ability to detect poisonous, warningly colored fruits B. ability to find ripe fruit C. ability to enjoy the esthetic value of pretty flowers D. ability to prepare for winter as portended by autumn colors of leaves E. None of the choices provided is likely correct.
A plant tissue that protects against water loss is the
a. epidermis. b. fibers. c. parenchyma. d. xylem
The first hormone discovered was
a. insulin. b. gastrin. c. secretin. d. thyroxine. e. estrogen.
Which of the following is a difference between gram+ and gram- cells?
a. gram+ cells contain less peptidoglycan than gram- cells b. gram- cell walls contain more peptidoglycan than gram+ cells c. only gram+ cells have peptidoglycan d. only gram- cells have a lipopolysaccharide layer