# Heredity and Variation Test 1

Total Questions:50 Total Time: 60 Min

Remaining:

## Questions 1 of 50

Question:Genetics is the branch of science which deals with the study of:

Cell structure

Cell function

Heredity and variation

Relation between plants and environment

## Questions 2 of 50

Question:The transmission of characteristics from one generation to successive generations of living things is known as:

Heredity

Evolution

Variations

Polymorphism

## Questions 3 of 50

Question:'Like begets like' is an important and universal phenomenon of life. This is due to:

Dominance

Inheritance

Evolution

Eugenics

## Questions 4 of 50

Question:The term genetics' was given by:

Morgan

Johannsen

Bateson

Mendel

## Questions 5 of 50

Question:Animals which appear alike in the body characters irrespective of their genetic make up are said to be:

monotype

phenotype

prototype

genotype

## Questions 6 of 50

Question:The visible character of the organism is known as:

genotype

phenotype

heterotype

morphotype

## Questions 7 of 50

Question:The body features are:

sex of the individual

controlled by environment

genotype

phenotype

## Questions 8 of 50

Question:Laws of inheritance were given by:

Lamarck

Khorana

Darwin

Mendel

## Questions 9 of 50

Question:Mendel conducted hybridisation experiments on:

Garden pea

Sweet pea

Wild pea

Pigeon pea

## Questions 10 of 50

Question:Mendel is famous for his work on:

Drosophila

Neurospora

Oenothera

Pisum

## Questions 11 of 50

Question:The reason why pea plants were suitable than dogs for Mendel's experiments:

Dogs have many genetic traits

There are no pedigree records of dogs

The pea plants favour cross-pollination

The pea plants can be self-fertilized

## Questions 12 of 50

Question:Mendel chose pea plants because:

they were having contrasting characters

they were easily available

they were cheap

of their great economic importance

## Questions 13 of 50

Question:When a cross is made between two parents with respect to a single character it is called:

Monohybrid

Dihybrid

Trihybrid

None of these

## Questions 14 of 50

Question:Monohybrid ratio is:

3 : 1

1 : 2

9 : 7

9 : 3 : 3 : 1

## Questions 15 of 50

Question:One of Mendel's pure strains of pea plants had white flowers. How many different kinds of eggs could such a plant produce with regard to flower colour?

One

Two

Four

Eight

## Questions 16 of 50

Question:A woman with straight hair mates with a man with curly hair and who is known to be heterozygous for the trait. What is the chance that their first child will have curly hair?

It is certain

No chance

One in two

One in four

## Questions 17 of 50

Question:In all of Mendel's experiments, the two alleles causing a trait were:

codominant

corecessive

incompletely dominant

dominant-recessive

## Questions 18 of 50

Question:When an allele fails to express itself in the presence of another, the latter is said to be:

Dominant

Epistatic

Recessive

Hypostatic

## Questions 19 of 50

Question:A cross between $${F_1}$$ hybrid and a recessive parent gives a ratio of:

3 : 1

2 : 1

1 : 1

4 : 1

## Questions 20 of 50

Question:In test cross:

the plants of $${F_1}$$ generation are crossed with dominant

the plants of $${F_1}$$ generation are crossed with recessive homozygous condition

the plants of $${F_1}$$ generation are crossed with either of the parents

the plants of $${F_1}$$ generation are not crossed

## Questions 21 of 50

Question:In hybridization, Tt x tt give rise to progeny of this ratio:

2 : 1

1 :2

1 : 2 : 1

1 : 1

## Questions 22 of 50

Question:Law of dominance-recessiveness is proved by:

Back cross

Monohybrid cross

Dihybrid cross

Incomplete dominance

## Questions 23 of 50

Question:An allele is dominant if it is expressed in:

Both homozygous and heterozygous states

Second generation

Homozygous combination

Heterozygous combination

## Questions 24 of 50

Question:If a plant heterozygous for tallness is selfed, the $${{\rm{F}}_{\rm{2}}}$$generation has both tall and dwarf plants. This proves the principle of:

Incomplete dominance

Dominance

Segregation

Independent assortment

## Questions 25 of 50

Question:In a dihybrid cross, pure homozygous plants will be:

9

3

2

1

## Questions 26 of 50

Question:Genotypic ratio of dihybrid cross is:

1:3:2:4:2:1:2:1:2

1 : 2 : 2 : 4 : 3 : 1 : 2 : 1

1:2:2:4:1:2:1:2:1

l : 2 : 2 :4 : 2 : 2 : 2 : l

## Questions 27 of 50

Question:What type of gametes are formed from a plant of genotype TtRr?

TR.Tr.tR.tr

TR and tr

TR only

Tt and Rr

## Questions 28 of 50

Question:In dogs, the barking trait is dominant over the silent trait and erect ears dominant over drooping ears. What is the expected phenotypic ratio of the offspring when dogs, heterozygous for both traits, are crossed?

1 : 1 : 1 : 1

9 : 3 : 4

9 : 3 : 3 : 1

9 : 7

## Questions 29 of 50

Question:Mendel did not notice/An exception to Mendel's laws:

Independent assortment

Dominance

Segregation

## Questions 30 of 50

Question:Which of the following is true for Mendelism but not for Darwinism?

It was modified by subsequent workers

It influenced human thought tremendously

It was based on insufficient data

It gave well defined principles even in early stage

## Questions 31 of 50

Question:How many gametes are produced in $${{\rm{F}}_{\rm{1}}}$$ generation of a trihybrid?

Three

Four

Six

Eight

## Questions 32 of 50

Question:Due to incomplete dominance, a cross between blue and white Andalusian fowl results in:

50% blue and 50% black

50% black and 50% white

50% white and 50% blue

75% black and 25% white

## Questions 33 of 50

Question:When red-flowered snapdragons are crossed with white-flowered snapdragons, their offspring have pink flowers. This type of genotypic expression is called:

dominant-recessive

co-dominance

co-recessive

incomplete dominance

## Questions 34 of 50

Question:In a monohybrid cross, when both alleles express equally well, the $${F_2}$$ phenotypic ratio becomes:

3 : 1

1 : 1

1 : 2 : 1

9 : 3 : 1

## Questions 35 of 50

Question:Which of the following is an example of polygenic inheritance?

Kernel colour in wheat

Human skin colour

Human height

All of these

## Questions 36 of 50

Question:In a mating between two mulattos, each heterozygous at all three gene loci for the skin colour, what is the chance their child will have very light skin?

1/64

1/4

5/8

9/16

## Questions 37 of 50

Question:Two nonallelic genes produce new phenotype when present together but fail to do so independently are called:

epistasis

polygene

complementary genes

non-complementary genes

## Questions 38 of 50

Question:Who has discovered the lethal gene of yellow coat in mice?

Cuenot

Morgan

|C) Muller

Correns

## Questions 39 of 50

Question:Albinism in corn is due to:

Deficiency of minerals

Deficiency of light

Lethal gene

Pathogen

## Questions 40 of 50

Question:A dominant lethal gene:

determines the sex of the organism

allows the organism to survive but not to reproduce

allows the organism to survive and to reproduce

kills the organism in which it is present

## Questions 41 of 50

Question:Phenotypic dihybrid ratio in $${F_2}$$ generation is:

1 : 3

9 : 3 : 3 : 1

1 : 2 : 1

1 : 1 : 1 : 1

## Questions 42 of 50

Question:If individuals of genotype AaBbCc are intercrossed, how many different genotypes can occur in their progeny?

6

8

16

27

## Questions 43 of 50

Question:The genotypes $$C/{C^{h}}$$ (normal colour), $${C^{ch}}/{C^h}$$ (chinchilla colour), $${{\rm{C}}^{\rm{h}}}/{\rm{c}}$$ (Himalayan colour), related to skin colour of rabbit represent:

multiple alleles

co-dominance

polygenic inheritance

complementary genes

## Questions 44 of 50

Question:The roan coat colour in shorthorn cattle is the result of:

Codominance

Incomplete dominance

Collaborative genes

Epistasis

## Questions 45 of 50

Question:The main aim of plant breeding is to:

control pollution

make soil fertile

become more progressive

produce improved varieties

## Questions 46 of 50

Question:When a plant of $${F_1}$$generation is crossed with homozygous dominant parents, it is known as:

simple cross

special cross

back cross

test cross

## Questions 47 of 50

Question:In Lathyrus odoratus, the cross between two purple flowered plants gave a white flowered progeny. This is due to:

codominance

complementary genes

incomplete dominance

segregation

## Questions 48 of 50

Question:A gene is said to be dominant if:

it never expresses in any condition

it expresses only in heterozygous condition

it expresses its effect only in homozygous condition

it expresses both in heterozygous and homozygous condition

## Questions 49 of 50

Question:In a back cross, a $${F_1}$$ hybrid is crossed with dominant parent, the offsprings:

1 tall : 3 short

3 tall : 1 short

1 tall : 1 short

All will be tall

## Questions 50 of 50

Question:Which of the following is an example of hybrid vigour?