Sunday, May 16, 2010

Can you answer these Q?

STATEMENT: Color-blindness is due to a sex-linked recessive gene. A colorblind man marries a normal-visioned woman whose father is colorblind.


6. We know this colorblind man received the gene from:


a) his father; b) his mother; c) both his mother and father;


d) either his father or mother; e) mutant sperm.





7. What percentage of their daughters would be colorblind?


a) 0%; b) 1/4; c) 1/2; d) 3/4; e) 100%.





8. How many unique gametes could be produced through independent assortment by an individual with the genotype Aa Bb CC Dd EE?


a) 4; b) 8; c) 16; d) 32; e) 1/64.





9. In snapdragons, heterozygotes have pink flower, whereas homozygotes have either red or white (recessive) flowers. When plants with red flowers are crossed with plant with white flowers, what proportion of the offspring will have pink flowers?


a) zero; b) 25%; c) 50%; d) 75%; e) 100%.





10. Black fur in mice (B) is dominant to brown fur (b) short tails (T) is dominant of long tails (t). What proportion of the progeny of the cross BbTt x Bbtt will have black fur and long tails?


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





11. A couple has three children, all of whom have brown eyes and blond hair. Both parents are homozygous for brown eyes (BB), but one is blond (rr) and the other is a redhead (Rr). What is the probability that the next child will be a brown-eyed redhead?


a) 1/16; b) 1/8; c) 1/4; d) 1/2; e) 1.

Can you answer these Q?
7) a


8) b


9) if the red flower is RR then e) 100% pink


if the red flower is Rr then c) 50% pink


10) c) 3/8


11) d) 1/2


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