The fruitfly cross shown here analyzes the transmission of two genes on the X chromosome. 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
In the parental generation, the genotype of the female parent is _____________, and the
genotype of the male parent is _____________.
A. w-cv-/w-cv- ; w-cv-/Y
B. w+cv+/w+cv+ ; w+cv-/Y
C. w-cv-/w+cv+ ; w-cv+/Y
D. w+cv+/w+cv+ ; w-cv-/Y
E. w+cv+/w-cv- ; w-cv-/Y
D
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Honeybee workers spend their first few weeks as young adults tending the colony's brood, then later shift jobs to foraging for food outside the colony
When researchers fed the young bees candy spiked with the molecule ethyl oleate, the young bees continued to babysit and delayed the job shift to foraging. What would it require to demonstrate that ethyl oleate normally acts as a pheromone, not as an endocrine or paracrine signal? A. It would require demonstration that ethyl oleate binds to a receptor and initiates a series of responses. B. It would require demonstration that ethyl oleate is released by another individual of the same species. C. It would require demonstration that ethyl oleate is released by a predator and causes a behavioral change in the prey.
Most dinosaurs became extinct
a. 10,000 years ago. b. 1 million years ago. c. 500 million years ago. d. 65 million years ago. e. 1 billion years ago.
In clinical studies, nutritional supplements that
block the activity of myostatin had which of the following effects?
a. increased muscle mass in both homozygotes and heterozygotes b. increased muscle mass in homozygotes only c. increased muscle mass in heterozygotes d. reduced muscle mass in both heterozygotes and homozygotes e. the nutritional supplements had on effect at all
Major gene reshuffling takes place during
a prophase I. b. metaphase I. c. anaphase I. d. metaphase II. e. anaphase II.