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Published on: 25/05/2021
QB365 Provides the updated NCERT Examplar Questions for Class 12 Biology, and also provide the detail solution for each and every ncert examplar questions , QB365 will give all kind of study materials will help to get more marks
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Questions + Answers key
Take MCQ Biology Test1.
In sickle cell anaemia glutamic acid is replaced by valine. Which one of the following triplets codes for valine?
G G G
A A G
G A A
G U G
2.
In a dihybrid cross, if you get 9:3:3:1 ratio it denotes that:
The alleles of two genes are interacting with each other
It is a multigenic inheritance.
It is a case of multiple allelism.
The alleles of two genes are segregating independently.
3.
If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is:
Autosomal dominant
Autosomal recessive
Sex-linked dominant
Sex-linked recessive.
4.
Conditions of a karyotype 2n ± 1 and 2n ± 2 are called:
Aneuploidy
Polyploidy
Allopolyploidy
Monosomy.
5.
Mother and father of a person with 'O' blood group have "A" and 'B' blood group respectively. What would be the genotype of both mother and father?
Mother is homozygous for "A" blood group and father is heterozygous for 'B'
Mother is heterozygous for 'A' blood group and father is homozygous for 'B'
Both mother and father are heterozygous for 'A' and 'B' blood group, respectively
Both mother and father are homozygous for "A" and 'B' blood group, respectively
6.
In the F2 generation of a Mendelian dihybrid cross the number of phenotypes and genotypes are :
phenotypes - 4; genotypes - 16
phenotypes - 9; genotypes - 4
phenotypes - 4; genotypes - 8
phenotypes - 4; genotypes - 9
7.
It is said that Mendel proposed that the factor controlling any character is discrete and independent. This proposition was based on the :
results of F3 generation of a cross
observations that the offspring of a cross made between the plants having two contrasting characters shows only one character without any biending
self pollination of F 1 offsprings
cross pollination of parental generations
8.
The inheritance pattern of a gene over generations among humans is studied by the pedigree analysis. Character studied in the pedigree analysis is equivalent to :
quantitative trait
Mendelian trait
polygenic trait
maternal trait
9.
In a certain taxon of insects some have 17 chromosomes and the others have 18 chromosomes. The 17 and 18 chromosome-bearing organisms are :
males and females, respectively
females and males, respectively
all males
all females
10.
Mendel's Law of independent assortment holds good for genes situated on the :
non-homologous chromosomes
homologous chromosomes
extra nuclear genetic element
same chromosome
1.
(d)
G U G
2.
(d)
The alleles of two genes are segregating independently.
3.
(d)
Sex-linked recessive.
4.
(a)
Aneuploidy
5.
(c)
Both mother and father are heterozygous for 'A' and 'B' blood group, respectively
6.
(d)
phenotypes - 4; genotypes - 9
7.
(b)
observations that the offspring of a cross made between the plants having two contrasting characters shows only one character without any biending
8.
(b)
Mendelian trait
9.
(a)
males and females, respectively
10.
(a)
non-homologous chromosomes
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