Generally, movements are accomplished by:
a. a single muscle exerting a pulling force only.
b. a single muscle exerting a pushing force only.
c. groups of muscles opposing the actions of one another.
d. groups of muscles collectively exerting pulling forces only.
e. groups of muscles collectively exerting pushing forces only.
c
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You mate two pea plants that are both AaBb and get a 3:1 phenotype ratio. This suggests
A. crossing-over occurred. B. independent assortment occurred. C. genes A and B are on different chromosomes. D. nondisjunction occurred. E. genes A and B are linked on the same chromosome.
Four of the five answers listed below are functions of the digestive organs. Select the exception
a. excretion b. absorption c. motility d. secretion e. digestion
The cross AaBb × AaBb is an example of a _______ cross and the results of such crosses led Mendel to propose what we now call the law of _______.
A: test; segregation of genes B: test; independent assortment C: dhybrid; independent assortment D: self; segregation of genes E: dihybrid; segregation of genes
The body region where a ciliary escalator helps to sweep microbes trapped in mucus away from that body site is the
A. respiratory tract. B. skin. C. digestive tract. D. urinary tract. E. eyes.