11) In rabbits, brown coat color is recessive to black coat color A black-coated
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Question
11) In rabbits, brown coat color is recessive to black coat color A black-coated female rabbit gives birth to four black-coated and three brown-coated baby rabbits. What can be deduced about the genotype of the baby rabbits' father? Which one of these answers is true? a. He must be homozygous brown. b. He must be homozygous black. C c. He could be either heterozygous black/brown or homozygous brown. c d. He must be heterozygous black/brown. c e. He could be either heterozygous black/brown or homozygous black. 12) This diagram shows a part of the biochemical pathway responsible for fruit color in the pepper, Caspicum anmum Enzyme 1 Enzyme 2 Colorless precursor Yellow pigment Red pigment Enzyme 1 is responsible for catalyzing the reaction that turns the colorless precursor into yellow pigment, whereas Enzyme 2 catalyzes the step that turns the yellow pigment into red pigment. A breeder crosses a pure-breeding plant that makes yellow peppers to a pure-breeding plant that makes red peppers. What proportion of the offspring will make red peppers? a. none of the offspring b. 1/4 c. 1/2 d. 3/4Explanation / Answer
Q11) a. He must be homozygous brown
if balck is dominant over brown means , if its show hetrozygous means (Bb) it gives black colour only . BB -- black colour , Bb- black colour , bb-- brown colour.
if mother rabbit is heterozygous black and father is homozygous brown
Bb * bb
B b * b b
Bb Bb bb bb-------F1 generation ; in this case some offspring are with black coat colour and some with brown coat colour, because mother is heterozygous black it has one recessive gene.
if mother rabbit is homozygous black and father is homozygous brown
BB * bb
B B * b b
Bb Bb Bb Bb-----F1 generation; all are black only, becauses mother has both dominant gene .
So father can not be heterozygous brown.
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