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Chapter: 12th Botany : Chapter 2 : Classical Genetics

Choose the Correct Answers

Botany : Classical Genetics : Book Back and Important Questions Answers - Multiple Choose the Correct Answers


Botany : Classical Genetics

Choose the Correct Answers

1. Extra nuclear inheritance is a consequence of presence of genes in

a) Mitrochondria and chloroplasts

b) Endoplasmic reticulum and mitrochondria

c) Ribosomes and chloroplast

d) Lysososmes and ribosomes


2. 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

a) aaBB

b) AaBB


d) aabb


3. How many different kinds of gametes will be produced by a plant having the genotype AABbCC?

a) Three

b) Four

c) Nine

d) Two


4. Which one of the following is an example of polygenic inheritance?

a) Flower colour in Mirabilis Jalapa

b) Production of male honey bee

c) Pod shape in garden pea

d) Skin Colour in humans


5. 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?

a) Only round seeds with green cotyledons

b) Only wrinkled seeds with yellow cotyledons

c) Only wrinkled seeds with green cotyledons

d) Round seeds with yellow cotyledons an wrinkled seeds with yellow cotyledons


6. Test cross involves

a) Crossing between two genotypes with recessive trait

b) Crossing between two F1 hybrids

c) Crossing the F1 hybrid with a double recessive genotype

d) Crossing between two genotypes with dominant trait


7. In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seed pant is crossed with a green seeded plant, what ratio of yellow and green seeded plants would you expect in F1 generation?

a) 9:1

b) 1:3

c) 3:1

d) 50:50


8. The genotype of a plant showing the dominant phenotype can be determined by

a) Back cross

b) Test cross

c) Dihybrid corss

d) Pedigree analysis


9. Select the correct statement from the ones given below with respect to dihydrid cross

a) Tightly linked genes on the same chromosomes show very few combinations

b) Tightly linked genes on the same chromosomes show higher combinations

c) Genesfarapartonthesamechromosomes show very few recombinations

d) Genes loosely linked on the same chromosomes show similar recombinations as the tightly linked ones


10. Which Mendelian idea is depicted by a cross in which the F1 generation resembles both the parents

a) Incomplete dominance

b) Law of dominance

c) Inheritance of one gene

d) Co-dominance


11. Fruit colour in squash is an example of

a) Recessive epistatsis

b) Dominant epistasis

c) Complementary genes

d) Inhibitory genes


12. In his classic experiments on Pea plants, Mendel did not use

a)Flowering position

b) Seed colour

c) Pod length

d) Seed shape


13. The epistatic effect, in which the dihybrid cross 9:3:3:1 between AaBb Aabb is modified as

a) Dominance of one allele on another allele of both loci

b) Interaction between two alleles of different loci

c) Dominance of one allele to another alleles of same loci

d) Interaction between two alleles of some loci


14. In a test cross involving F1 dihybrid flies, more parental type offspring were produced than the recombination type offspring. This indicates

a) The two genes are located on two different chromosomes

b) Chromosomes failed to separate during meiosis

c) The two genes are linked and present on the some chromosome

d) Both of the characters are controlled by more than one gene


15. The genes controlling the seven pea characters studied by Mendel are known to be located on how many different chromosomes?

a) Seven

b) Six

c) Five

d) Four


16. Which of the following explains how progeny can posses the combinations of traits that none of the parent possessed?

a) Law of segregation

b) Chromosome theory

c) Law of independent assortment

d) Polygenic inheritance


17. “Gametes are never hybrid”. This is a statement of

a) Law of dominance

b) Law of independent assortment

c) Law of segregation

d) Law of random fertilization


18. Gene which suppresses other genes activity but does not lie on the same locus is called as

a) Epistatic

b) Supplement only

c) Hypostatic

d) Codominant


19. 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

a) Dominance

b) Inheritance

c) Codominance

d) Heredity


20. The dominant epistatis ratio is

a) 9:3:3:1

b) 12:3:1

c) 9:3:4

d) 9:6:1


21. Select the period for Mendel’s hybridization experiments

a) 1856 - 1863

b) 1850 - 1870

c) 1857 - 1869

d) 1870 - 1877


22. Among the following characters which one was not considered by Mendel in his experimentation pea?

a) Stem – Tall or dwarf

b) Trichomal glandular or non-glandular

c) Seed – Green or yellow

d) Pod – Inflated or constricted


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