Free Principles Of Inheritance And Variation (Weekly Quiz: 2) NEET Biology Questions & Answers with Detailed Explanation & Full Review

Question-1

Assertion (A) In $F_2$ -generation, the traits seen in the progeny were identical to their parents.
Reason (R) The progeny of the $F_2$ -generation show no blending of traits.

(a) If both A and R are true, but R is not the correct explanation of A

(b) If both A and R are true and R is the correct explanation of A

(c) If A is true, but R is false

(d) If A is false, but R is true

Question-2

In Down's syndrome of a male child, the sex complement is

(a) XY

(b) XO

(c) XX

(d) XXY.

Question-3

Blood group 'B' will have alleles

(a) $I^AI^A$

(b) ii

(c) $I^BI^B$

(d) $I^AI^B$

Question-4

Which karyotype present monosomy?

(a) 2n – 2

(b) 2n + 1

(c) 2n – 1

(d) 2n + 2

Question-5

What is true about the crossing over between linked genes?

(a) Hardly any crossing over

(b) High percentage of crossing over

(c) No crossing over at all

(d) None of these

Question-6

In case of codominance, the offsprings of $F_{1}$ generation have the trait

(a) of both the parents.

(b) of either of two parents.

(c) of none of the parents.

(d) in between the traits of two parents.

Question-7

The allele which expresses itself in both homozygous and heterozygous condition is called

(a) recessive allele

(b) dominant allele

(c) incomplete dominant allele

(d) split allele

Question-8

A diseased man marries a normal woman. They get three daughters and five sons. All the daughters were diseased and sons were normal. The gene of this disease is

(a) sex limited character

(b) sex linked recessive

(c) sex linked dominant

(d) autosomal dominant

Question-9

An abnormal human baby with 'XXX' sex chromosomes was born due to

(a) fusion of two sperms and one ovum

(b) fusion of two ova and one sperm

(c) formation of abnormal sperms in the father

(d) formation of abnormal ova in the mother.

Question-10

1. Short statured body with small round head.
2. Furrowed tongue and partially opened mouth.
3. Palmis broad with characteristic palm crease.
4. Slow physical, psycomotor and mental development.

These are the characters of

(a) Turner's syndrome

(b) Down's syndrome

(c) Klinefelter's syndrome

(d) Edward syndrome