Which of the following represents the expected genotypes of an F1 generation consisting of 8 individuals from a cross of a true-breeding black BB. rabbit and a true-breeding white bb. rabbit?
A. 8 BB, 0 bb, 0 Bb
B. 4 BB, 4 bb, 0 Bb
C. 2 BB, 2 bb, 4 Bb
D. 0 BB, 0 bb, 8 Bb
D
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Plasmids are used as vectors in plant and bacterial genetic engineering. However, there is a major difference in the fate of genes introduced into bacteria on most bacterial plasmids and into plants on tumor-inducing (Ti) plasmids. What is this difference
A) In bacteria, genes are stably expressed; in plants, gene expression is always lost quickly. B) Gene expression tends to decrease rapidly and unpredictably in bacteria; gene expression is much more stable in plants. C) Bacterial plasmids are circular DNAs; Ti plasmid DNA is linear. D) Bacterial plasmids and the genes they carry usually are not integrated into the chromosome; Ti plasmids and the genes they carry are integrated into the chromosome. E) Bacterial plasmids typically do not modify the growth of the host cells; Ti plasmids modified for genetic engineering always produce plant galls.
The tips of the branches on a phylogenetic tree represent:
A. present-day groups. B. common ancestors. C. analogies. D. sister groups. E. homologies.
Suppose that in the future, scientists identify bacteria on Mars and these organisms lack a site-specific recombination system. Which components would allow for site-specific recombination to occur in these bacteria?
A) FRT target sites and Flp recombinase B) FRT target sites and Cas9 enzyme C) an FRT target site and a loxP site D) a synthetic homologous chromosome
Prions are composed of a single protein called (plaque/BSE/PrP)
What will be an ideal response?