In minks, the gene for brown fur (B) is dominant to the gene for silver fur (b). The parents with brown fur produces offspring with silver fur. The genotype of parents are

B b \times B b

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B B \times B b

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B B \times b b

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B b \times b b

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None of the above

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Solution

The correct option is A $B b \times B b$
Brown fur is dominant over silver fur. To have progeny with silver fur, both parents should have at least one allele for silver fur (b) as the recessive traits can be expressed in homozygous conditions only. The phenotype of parents is brown, means they have least one allele for brown fur (B). "bb" genotype gives silver fur while both the parents have brown fur. Both parents are heterozygous and have genotype "Bb". Thus, the correct answer is option A.

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Similar questions

In a certain species of animals, black fur (B) is dominant over brown fur (b). Predict the genotype and phenotype of the offspring when both parents are 'Bb' or have heterozygous black fur.

List I	List II
A. $B B \times b b$	1. 100% bb
B. $B b \times B b$	2. 25% BB, 50% Bb, 25% bb
C. $B B \times B B$	3. 100% BB
D. $b b \times b b$	4. 100% Bb

Match the genetic cross of the parents on the left with the genotypes on the right of the offspring most likely to be produced from that cross.

Q. The following crosses were performed between parental lines with indicated genotypes.
(i)

B B \times B b

(ii)

A A b b \times a a B B

(iii)

B B \times b b

(iv)

B b \times B b

(v)

A A \times A A

(vi)

b b \times B b

The above crosses that are expected to produce only

50

% homozygotes among the F

_{1}

progeny are

Q. (a) What is a 'gene'? Explain the meaning of dominant genes and recessive genes with examples.

(b) In humans, if gene B gives brown eyes and gene b gives blue eyes, what will be the colour of the eyes of the persons having the following combinations of genes?
(i) BB (ii) bb (iii) Bb

Q. When the two parental genotypes BB and bb are crossed, the genotype of all F

_{1}

plants is Bb. On selfing of F

_{1}

generation, how many dominant phenotypes will be produced in F

_{2}

generation?

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