A single recessive trait, able to express must be on
(a) Y chromosome
(b) X chromosome in male
(c) X chromosome in female
(d) autosome

Open in App

Solution

(b) X chromosome in male

As males have only one X chromosome, the trait present on it is always expressed. So, a single recessive trait can be expressed only when it is present on X chromosomes in males.

Suggest Corrections

Similar questions

Q. A single recessive trait, able to express must be on
(a) Y chromosome
(b) X chromosome in male
(c) X chromosome in female
(d) autosome

Q. A single recessive trait, able to express must be on
(a) one Y chromosome
(b) one X chromosome
(c) autosome
(d) none of these

Question 20
The two versions of a trait (character) which are brought in by the male and female gametes are situated on

(a) copies of the same chromosome
(b) two different chromosomes
(c) sex chromosomes
(d) any chromosome

Q. Expression of recessive genes on X-chromosome occurs in males because of.

Q. Assertion :In humans, the gamete contributed by the male determines whether the child produced will be male or female. Reason: Sex in humans in a polygenic trait depending upon a cumulative effect of some genes on X chromosome and some on Y chromosome.

Join BYJU'S Learning Program

A single recessive trait, able to express must be on (a) Y chromosome (b) X chromosome in male (c) X chromosome in female (d) autosome

(b) X chromosome in maleAs males have only one X chromosome, the trait present on it is always expressed. So, a single recessive trait can be expressed only when it is present on X chromosomes in males.

A single recessive trait, able to express must be on
(a) Y chromosome
(b) X chromosome in male
(c) X chromosome in female
(d) autosome

(b) X chromosome in male

As males have only one X chromosome, the trait present on it is always expressed. So, a single recessive trait can be expressed only when it is present on X chromosomes in males.