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Concept of Dominance and Recessiveness

If B is the g...

Question

If B is the gene for brown eyes and b is the gene for blue eyes, which combination of genes in the zygote will produce children with blue eyes ?

A

Bb

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B

bB

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C

BB

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D

bb

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Solution

The correct option is C bb
The dominant gene is represented by a capital letter and the corresponding recessive gene is represented by the corresponding small letter. Genotype is a pair of letters such as BB, Bb or bb. The genotype of brown eyes is BB or Bb whereas that of blue eyes is bb.

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Similar questions

(a) E is the gene for brown eye colour and e is the gene for blue eye colour. Which gene is (i) recessive, and (ii) dominant?

(b) Both father and mother have the genes Ee in their cells. What colour are their eyes?

(c) Which combination of genes in the zygote will produce children with blue eyes?

(d) Which combination of genes in the zygote will produce children with brown eyes?

Q. The gene for blue eyes(b) is recessive to gene for brown eyes(B). The following figure is given:
what is the % of individuals with brown eyes and blue eyes respactively?

Q. In humans, if gene B gives brown eyes and gene b gives blue eyes. What will be the colour of eyes of the persons having the following combination of genes?

Q. In humans, if gene B gives brown eyes and gene b gives blue eyes. What will be the colour of eyes of the persons having the following combination of genes?
(a) Bb
(b) bb
(c) BB

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

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