Which of the following is a likely mechanism for gene dosage compensation?
A. One X chromosome of the female (XX) is inactivated.
B. Two X chromosomes of a hermaphradite (XX) are transcribed at one-half the level of the single X chromosome of the male (XO).
C. The single X chromosome of the male (XY) is transcribed at twice the level of the X chromosomes of the female (XX).
D. All of the choices are correct.
D
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a. True b. False Indicate whether the statement is true or false
Soils in tropical rain forests are nutrient rich
Indicate whether the statement is true or false.
Organisms capable of producing their own food are known as
a. autotrophs. b. heterotrophs. c. omnivores. d. Herbivores.
A portion of DNA that encodes a specific protein is
a) a gene. b) a chromosome. c) a chromatid. d) a centromere. e) a kinetochore.