A recessive allele on the X chromosome causes color deficiency. A color-deficient boy has a mother with normal vision and a color-deficient father. From which parent did he get the color-deficiency gene?
A) Mother B) Father C) Either mother or father
A
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The number of DNA molecules in a duplicated
chromosome is a. one. b. undetermined. c. half that of an unduplicated chromosome. d. two. e. four.
Two Martians fall in love and marry. One Martian is homozygous for red eyes and the other is heterozygous. The recessive eye color is purple. What is the probability that they will have a child with purple eyes?
a. 1/1 b. 1/2 c. 1/4 d. 3/4 e. 0
An outbreak caused by a batch of bad potato salad at a picnic is called a________ outbreak
a. Point source b. Common-source c. Propagated d. All of the above
What happens during countercurrent exchange in fishes?
A) Gas exchange occurs as blood and water move in opposite directions across a respiratory surface. B) Gas exchange occurs as blood and water move in the same direction across a respiratory surface. C) Oxygen enters the blood by diffusion, and carbon dioxide exits the blood by active transport. D) Oxygen enters the blood by active transport, and carbon dioxide exits the blood by diffusion. E) Oxygen and carbon dioxide move in opposite directions across the respiratory surface by facilitated diffusion.