In Drosophila, a narrow, reduced eye is called a bareye
It is due to a dominant X-linked allele (B),
whereas the full wild-type is due to the recessive
gene (B +). Give the F1 and F2 genotypic and
phenotypic expectations of a cross of a homozygous
wild-type female with a bar-eyed male. What will be an ideal response?
Answer: B+B+ x BY ———> F1: B+B wild female B+Y wild
male F2: 1/4 BY bar male, 1/4 B + Y wild male 1/4 B
+ B + wild female 1/4 B + B wild female
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Plants and animals that rely on diffusion to move molecules through their bodies tend to ________
a. be large b. have respiratory and vascular systems c. be small and flat d. evolve few adaptations because diffusion is a passive process
Something that is able to replenish itself is a: a. stock
b. fossil fuel. c. landing. d. renewable resource.
Four of the five choices listed below describe the
heterozygous condition. Select the exception. a. homozygous b. carrier c. heterozygotes d. hybrid e. Aa
Which of the following statements is false?
a. The tissues of arthropods are bathed with hemolymph, which delivers oxygen to their cells. b. In an open circulatory system the heart is still responsible for pumping oxygen-rich fluid. c. Earthworms have a central heart that pumps blood to all their tissues. d. Blood vessels are found in the open circulatory systems common to some invertebrates. e. Hemocyanin is the oxygen transport pigment found in the open circulatory system of invertebrates