Which of the following lists is ordered from smallest (least inclusive) to largest (most inclusive)?
A. Cell < Tissue < Organelle < Individual < Community
B. Community < Population < Ecosystem < Biosphere
C. Organelle < Cell < Organ < Individual < Population
D. Individual < Ecosystem < Community < Biosphere
Ans: C. Organelle < Cell < Organ < Individual < Population
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Cancer can be characterized by:
A. a mass of rapidly dividing cells called a tumor. B. metastasized tumor cells that leave the tumor and invade distant parts of the body. C. cells that express of a type of intermediate filament that is inappropriate for that area of the body. D. cells with an enhanced ability to adhere to proteins in the basal lamina. E. All of these choices are correct.
The F2 phenotypic ratio of 9:3:4 is a result of a cross
involving a. two genes expressing complete dominance. b. a gene expressing dominance and another gene expressing codominance. c. two genes expressing codominance. d. epistasis, in which one gene modifies the expression of the other gene. e. multiple alleles.
DDT was first used as an insecticide in 1942. Resistance genes existed before this time in houseflies and other insects. By 1970, no farmer would bother using this chemical. Why?
What will be an ideal response?
Color blindness is a recessive sex-linked trait. If a man with normal color vision and a woman who is a carrier for the color blindness trait have a son, what is the probability that he will be color-blind?
A. 0% B. 25% C. 50% D. 100%