(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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Solution

(a) A gene is a unit of inheritance that is transferred from the parent to the offspring. It controls the expression of a character. The gene which can express its character even when it is present as a single copy is called a dominant gene. Also it is able to express its characters in all the generations.
However, a gene which can express its character, only when it is present in pairs is called a recessive gene.

(b) (i) BB - brown eyes
(ii) bb - blue eyes
(iii) Bb - brow eyes

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Similar questions

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

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

(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?

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

Q. 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 ?

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?

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(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

(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