The sex of the fruit fly Drosophila melangaster is determined as follows: XX chromosomes give a female and XY give a male. The gene for bar eyes is recessive and located on the X chromosome. If you had a normal-eyed female and did not know whether she was homozygous or heterozygous, you could determine her genotype by mating her with
A. any kind of male.
B. normal-eyed males only.
C. bar-eyed males only.
D. homozygous, bar-eyed males only.
A. any kind of male.
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How is budding of bacteria to produce daughter cells different from binary fission?
A. The chromosome does not need to be replicated. B. The bud doesn't receive any DNA. C. The cytoplasmic division is unequal. D. A septum must form during budding.
Which of the following are atmospheric greenhouse gases?
A. methane B. carbon dioxide C. nitrous oxide D. chlorofluorocarbons E. all of the choices
In some cases, when an insect begins feeding on a leaf the plant responds by activating a signaling
pathway that results in the production of ____, which disrupt an insect's capacity to digest proteins.
a. gibberellins b. lipases c. chitinases d. protease inhibitors e. cytokinins
What factor is contributing to the decline in fish populations?
A) destruction of Girard Boro Parks wetland B) elevated pollution levels in elk creek C) dams being built D) all of the above