Genes
What will be an ideal response?
DNA segments that serve as the key functional units in hereditary transmission.
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The fruitfly cross shown here analyzes the transmission of two genes on the X chromosome. In the parental generation, the male parent carries mutant alleles for both the white gene (w) and the crossveinless gene (cw)
The female parent carries nonmutant forms of these genes. A cross between siblings of the F1 generationâ€"a red-eyed, crossveined female and a red-eyed, crossveined maleâ€"generates F2 progeny. Examine the genotype of the F2 male progeny. Notice that the progeny fall into two groups. Refer to this figure when answering the following question: The numbers of male F2 progeny with each of the four observed phenotypes are as follows: Red-eyed, crossveined = 357 White-eyed, crossveinless = 341 Red-eyed, crossveinless = 52 White-eyed crossveined = 45 What is the map distance between the two genes w and cw? A. 97 B. 12.2 C. 341 D. 357 E. 13.9
The bacterial cells can be distinguished from rice plant cells because bacterial cells do not
have __________.
a. cell walls b. membrane-bound organelles c. genetic material d. cell membranes
Which biome is characterized by plants whose leaves turn color and drop off in the autumn?
A. Coniferous forest B. Tundra C. Temperate deciduous forest D. Tropical rain forest E. Chaparral
The HIV virus attaches to the ________, and is thus taken into certain immune cells.
A. receptor protein CD4 B. flagellum C. glycocalyx D. marker proteins type A or B on red blood cells