During swallowing food, which structure moves downward to prevent food from entering the trachea?
a. larynx
b. pharynx
c. glottis
d. epiglottis
e. bronchus
ANSWER: d
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Which of the following is NOT an accessory
organ of the human digestive system? a. salivary gland b. esophagus c. pancreas d. gallbladder e. liver
Flowers:
a. Are structures of plants that are only ornamental and have no reproductive value in plants b. Produce both pollen and egg cells c. Produce pollen only d. Produce egg cells only e. Are produced by both gymnosperms and angiosperms
Which would change allele frequencies more quickly: selection against a dominant allele or selection against a recessive allele?
What will be an ideal response?
The gene that codes for the number of fingers on the human hand has two alleles—five fingers and six fingers. The letters F and f are used to represent this trait. Having five fingers is the recessive trait. A woman has six fingers, but one of her parents has five fingers. She marries a man who has five fingers. What is the probability that they will have a child who is homozygous dominant for this trait?
a. 0 percent b. 25 percent c. 50 percent d. 100 percent