Two characters that appear in a 9:3:3:1 ratio in the F2 generation should have which of the following properties?
A) Each of the traits is controlled by single genes.
B) The genes controlling the characters obey the law of independent assortment.
C) Each of the genes controlling the characters has two alleles.
D) Four genes are involved.
E) Sixteen different phenotypes are possible.
Ans: B) The genes controlling the characters obey the law of independent assortment.
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Fertilization in humans occurs in the
a. ovary. b. uterus. c. vagina. d. oviduct. e. follicle
Answer questions 38–42 in reference to the four “habitat” items
listed below. a. habitat fragmentation b. habitat island c. habitat loss d. habitat M 38. This describes where a species lives. M 39. This reduces a habitat’s area, making species more vulnerable to extinction. M 40. This could be the result of chemical pollution. D 41. This is an inhabited area surrounded by unsuitable habitat. D 42. This action may result in a lack of sufficient resources to sustain the population.
Following intense exercise, the human body attempts to overcome oxygen debt by
A) sweating. B) elevating heart rate. C) producing ATP. D) taking deep breaths. E) inhibiting contractions of smooth muscle.
Which of the following represents the lowest level of chromatin packaging?
a. 10 nm fiber b. chromonema fiber c. nucleosome d. 30 nm fiber e. interphase chromatid