Albinism is an autosomal (not sex-linked) recessive trait. A man and woman are both of normal pigmentation, but both have one parent who is albino (without melanin pigmentation). What is the probability that their first female child will have albinism?
A) 0
B) 1/8
C) 1/2
D) 1/4
E) 1
Answer: D
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The open ocean is a(n) ________ environment.
A. oligotrophic B. phylotrophic C. eutrophic D. neotrophic
Mendel was quite ahead of his time in genetics, and many of his hypotheses have stood up to newer discoveries. However, we now know that independent assortment has many exceptions. Which of the following is an exception to the law of independent assortment?
a. monohybrid cross b. test cross c. gene linkage d. random mutation
Answer the following statements true (T) or false (F)
1. Plants appear green to the human eye because the pigment chlorophyll a absorbs the visible light wavelengths from either end of the visible spectrum, such as red and violet. 2. Calvin cycle reactions are an essential process by which plants produce lipids. 3. Plasmids are small loops of genetic material that are essential for a prokaryotic cell’s normal growth. 4. When a cell replicates and divides, most of the phases of mitosis involve reproduction of the cell’s genetic material. 5. This statement is true. When a cell replicates and divides, most of the phases of mitosis involve reproduction of the cell’s genetic material.
The concentration of nitrogen in the earth’s
atmosphere is approximately a. 48 percent. b. 58 percent. c. 68 percent. d. 78 percent. e. 88 percent.