Multifactorial (complex) diseases
a. are less common than single-gene diseases.
b. involve the interaction of many genes with the environment.
c. affect less than 1 percent of humans.
d. involve the interactions of several mRNAs.
e. are exemplified by sickle-cell disease.
Answer: b. involve the interaction of many genes with the environment.
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A) the red pigment gene is on the X chromosome, the green is on an autosome. B) the green pigment gene is on the X chromosome, the red is on an autosome. C) the rhodopsin gene is on the X chromosome. D) both the red and the green pigment genes are on the X chromosome. E) both the red and the green pigment genes are on an autosome.
All fungi _____
a. are multicelled c. are heterotrophs b. form flagellated spores d. are all of these
Choose the true statement about genome size and gene number in animals.
A. Genome size differences depend to a large extent on the amount of retrotransposon DNA present. B. The pufferfish has a larger genome than humans and more genes. C. There is a strong correlation between the number of genes and genome size. D. Much of the extra DNA in humans is in the form of exons.
Which of the following is an adaptation that helped plants move from aquatic environments to the land?
A) seeds B) a cuticle C) swimming sperm D) pollen