Assuming complete dominance, crosses between two dihybrid F1 pea plants, which are offspring from a cross AABB aabb, result in F2 phenotype ratios of _____
a. 1:2:1
b. 3:1
c. 1:1:1:1
d. 9:3:3:1
D
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Which type of intravenous solution would be recommended for a patient who is dehydrated?
a) an isotonic solution b) a hypotonic solution c) a hypertonic solution
Phages are being considered for:a
vectors in gene therapy experiments. b. antibiotics in bacterial infections. c. gene transfer vectors in animal cells. d. being equivalent to the first living organisms. e. All of the above
In a bacterial cross in which the donor (Hfr) is a+b+ and the recipient strain (F?) is a?b?, it is expected that recombinant bacteria ________
A) will all be a+b+ B) will all remain a?b? C) will be a mixture of a+b+, a?b?, a+b?, and a?b+ D) will be a mixture of a+b+ and a?b? E) will be a mixture of a+b+, a?b?, and a?b+
The origin of a new plant species by hybridization coupled with nondisjunction is an example of
A) allopatric speciation. B) sympatric speciation. C) autopolyploidy. D) heterochrony. E) habitat selection.