What is the role of the villi?
A) To absorb small nutrient molecules from the digestive tract
B) To move food along the digestive tract
C) To secrete digestive enzymes into the digestive tract
D) To secrete water into the digestive tract
Answer: A) To absorb small nutrient molecules from the digestive tract
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Which animal is a chordate?
(a) sea star. (b) sea cucumber. (c) acorn worm. (d) lancelet.
Achondroplasia is a form of dwarfism in humans. It is caused by a mutant allele of the fibroblast growth factor receptor gene (FGFR) that produces an overactive protein. Having one copy of the mutant allele results in dwarfism. Two copies of the mutant allele results in death before birth. Based in this information, what can you infer about the inheritance of the FGFR alleles?
A) The mutant FGFR allele is pleiotropic. B) Some achondroplastic dwarfs are heterozygous for the mutant allele and some are homozygous. C) The wild-type and mutant FGFR alleles are codominant. D) The mutant FGFR allele shows incomplete penetrance.
Which are characteristics of Lepromatous Leprosy?
What will be an ideal response?
Mendel selected seven traits in pea plants to study. Why were his results relatively easy to interpret, even though he was examining seven distinct traits?
a. All seven traits were easy to characterize. b. The seven alleles segregated independently from each other. c. Peas are easy to raise and have short life cycles. d. He knew enough mathematics to apply rules of probability to his results.