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Published on: 27/08/2022
QB365 provides a detailed and simple solution for every Possible Book Back Questions in Class 12 Biology Subject - Botany - Classical Genetics, English Medium. It will help Students to get more practice questions, Students can Practice these question papers in addition to score best marks.
Download Tamil Nadu 12th Standard Biology question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Biology Test1.
Among the following characters which one was not considered by Mendel in his experimentation pea?
Stem – Tall or dwarf
Trichomes glandular or non-glandular
Seed – Green or yellow
Pod – Inflated or constricted
2.
Select the period for Mendel’s hybridization experiments.
1856 - 1863
1850 - 1870
1857 - 1869
1870 - 1877
3.
The dominant epistasis ratio is ______.
9:3:3:1
12:3:1
9:3:4
9:6:1
4.
Pure tall plants are crossed with pure dwarf plants. In the F1 generation, all plants were tall. These tall plants of F1 generation were selfed and the ratio of tall to dwarf plants obtained was 3:1. This is called ______.
Dominance
Inheritance
Codominance
Heredity
5.
Gene which suppresses other genes activity but does not lie on the same locus is called as _____.
Epistatic
Supplement only
Hypostatic
Codominant
6.
“Gametes are never hybrid”. This is a statement of ______.
Law of dominance
Law of independent assortment
Law of segregation
Law of random fertilization
7.
Which of the following explains how progeny can posses the combinations of traits that none of the parent possessed?
Law of segregation
Chromosome theory
Law of independent assortment
Polygenic inheritance
8.
The genes controlling the seven pea characters studied by Mendel are known to be located on how many different chromosomes?
Seven
Six
Five
Four
9.
In a test cross involving F1 dihybrid flies, more parental type offspring were produced than the recombination type offspring. This indicates ______.
The two genes are located on two different chromosomes
Chromosomes failed to separate during meiosis
The two genes are linked and present on the some chromosome
Both of the characters are controlled by more than one gene
10.
The epistatic effect, in which the dihybrid cross 9:3:3:1 between AaBb Aabb is modified as ______.
Dominance of one allele on another allele of both loci
Interaction between two alleles of different loci
Dominance of one allele to another alleles of same loci
Interaction between two alleles of some loci
11.
In his classic experiments on Pea plants, Mendel did not use ______.
Flowering position
Seed colour
Pod length
Seed shape
12.
13.
14.
Select the correct statement from the ones given below with respect to dihydrid cross.
Tightly linked genes on the same chromosomes show very few combinations
Tightly linked genes on the same chromosomes show higher combinations
Genes far apart on the same chromosomes show very few recombinations
Genes loosely linked on the same chromosomes show similar recombinations as the tightly linked ones
15.
The genotype of a plant showing the dominant phenotype can be determined by _____.
Back cross
Test cross
Dihybrid cross
Pedigree analysis
16.
In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seed plant is crossed with a green seeded plant, what ratio of yellow and green seeded plants would you expect in F1 generation?
9:1
1:3
3:1
50:50
17.
Test cross involves ____.
Crossing between two genotypes with recessive trait
Crossing between two F1 hybrids
Crossing the F1 hybrid with a double recessive genotype
Crossing between two genotypes with dominant trait
18.
In Mendel’s experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY x rryy?
Only round seeds with green cotyledons
Only wrinkled seeds with yellow cotyledons
Only wrinkled seeds with green cotyledons
Round seeds with yellow cotyledons and wrinkled seeds with yellow cotyledons
19.
20.
How many different kinds of gametes will be produced by a plant having the genotype AABbCC?
Three
Four
Nine
Two
21.
In order to find out the different types of gametes produced by a pea plant having the genotype AaBb, it should be crossed to a plant with the genotype _____.
aaBB
AaBB
AABB
aabb
22.
Extra nuclear inheritance is a consequence of presence of genes in _____.
Mitrochondria and chloroplasts
Endoplasmic reticulum and mitrochondria
Ribosomes and chloroplast
Lysososmes and ribosomes
1.
(b)
Trichomes glandular or non-glandular
2.
(a)
1856 - 1863
3.
(b)
12:3:1
4.
(a)
Dominance
5.
(a)
Epistatic
6.
(c)
Law of segregation
7.
(c)
Law of independent assortment
8.
(a)
Seven
9.
(c)
The two genes are linked and present on the some chromosome
10.
(b)
Interaction between two alleles of different loci
11.
(c)
Pod length
12.
(b)
13.
(d)
14.
(a)
Tightly linked genes on the same chromosomes show very few combinations
15.
(b)
Test cross
16.
(d)
50:50
17.
(c)
Crossing the F1 hybrid with a double recessive genotype
18.
(d)
Round seeds with yellow cotyledons and wrinkled seeds with yellow cotyledons
19.
(d)
20.
(c)
Nine
21.
(d)
aabb
22.
(a)
Mitrochondria and chloroplasts
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