Gynandromorphs are animals having

same sex in all cells of the body
different sexes in all cells of the body
same sex in different cells of the body
different sexes in different cells of the body

The syndrome in which individual somatic cell contains three sex chromosomes XXX is called

Klinefelter’s syndrome
Turner syndrome
Down’s syndrome
Super female

Which is a sex influenced trait ?

Baldness in man
Hairy pinna
Porcupine skin in man
Colour blindness in man

In blood group typing in human, if an allele contributed by one parent is I^A and an allele contributed by the other parent is i, the resulting blood group of the offspring will be

9 : 6 : 1 F₂ generation ratio is obtained in case of

polymeric genes
pleiotropic genes
supplementary genes
recessive epistasis

DIRECTIONS : Each questions contain STATEMENT-1 (Assertion) and STATEMENT-2 (Reason). Each question has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.

Statement 1 : Mendel was successful in his hybridization.

Statement 2 : Garden pea proved ideal experimental material.

Statement - 1 is True, Statement - 2 is True, Statement - 2 is a correct explanation for Statement - 1
Statement - 1 is True, Statement - 2 is True ; Statement - 2 is NOT a correct explanation for Statement - 1
Statement - 1 is True, Statement - 2 is False
Both the Statements are False.

Solution

Mendel chose garden pea as plant material for his experiments, since it had the following advantages:

(i) Well defined characters.

(ii) Bisexual flowers.

(iii) Predominantly self-fertilization.

(iv) Easy hybridization.

Besides these features, garden pea, being self-fertilized,had pure lines due to natural self-fertilization for a number of years. Therefore, any variety used was pure for the characters it carried. Mendel’s success was mainly based on the fact that he considered a single character at onetime.

DIRECTIONS : Each questions contain STATEMENT-1 (Assertion) and STATEMENT-2 (Reason). Each question has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.

Statement 1 : In Mirabilis, selfing of F₁ pink flower plants produces same phenotypic & genotypic ratio.

Statement 2 : Flower colour gene shows incomplete dominance.

Statement - 1 is True, Statement - 2 is True, Statement - 2 is a correct explanation for Statement - 1
Statement - 1 is True, Statement - 2 is True ; Statement - 2 is NOT a correct explanation for Statement - 1
Statement - 1 is True, Statement - 2 is False
Both the Statements are False.

Solution

Observe the sex determination in the following

(1) Human males = XY
(2) Female hen = ZW
(3) Male Drosophila = XY
(4) Male grasshopper = XO
(5) Male birds = ZZ
Male heterogamety = A
Female heterogamety = B
Male homogamety = C

Which of the following combination is correct ?

A → 1,3,4; B → 2; C → 5
A → 2,4; B → 1; C → 3
A → 3,4; B → 2; C → 1
A → 2,4; B → 1; C → 2

Chromosomal aberration occurs due to

(1) deletion

(2) duplication

(3) inversion

(4) translocation

(1), (3) and (4)
(1), (2), (3) and(4)
(2), (3) and (4)
(1), (2) and (3)

Inheritance of blood group is a condition of

(1) Codominance

(2) Incomplete dominance

(3) Multiple allelism

(4) Dominance

(1) and (2)
(2) and (4)
(1), (3) and (4)
(2) and (3)

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