16 .Black fur in mice (B) is dominant to brown fur (b). Short tails (T) are domi

Question

16.Black fur in mice (B) is dominant to brown fur (b). Short tails (T) are dominant to long tails (t). What fraction of the progeny of the cross BbTt × BBtt will have black fur and long tails?

(a)1/16 (b) 3/16 (c)3/8 (d) 1/2 (e)9/16

17. A 0.1% frequency of recombination is observed

(a) only in sex chromosomes.
(b) only on genetic maps of viral chromosomes.

(c) on unlinked chromosomes.

(d) in any two genes on different chromosomes.

(e) in genes located very close to one another on the same chromosome.

KEY: 16. d

17. e

Please explain your answer, will give a thumbs up. Thank you.

Explanation / Answer

16. As there is no way a mouse in the first generation can have bb as the genotype for the fur colour, all mice will be black. For the tail,

Therefore, 50% will have long tails (Tt)

Answer: d. 1/2

17. Genes located very close to each other often fail to segregate, meaning that their proximity makes them more likely to be passed down together. Mendel's law of independent assortment is not observed, as the genes do not segregate independently as the segregation is affected by the proximity between the genes.

Answer: d.

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