Heredity and Variation Test 4

Total Questions:50 Total Time: 60 Min



Questions 1 of 50

Question:Alleles of a gene are found on:

Answers Choices:

same chromosome

homologous chromosomes

nonhomologous chromosomes

any chromosomes

Questions 2 of 50

Question:An organism with two identical alleles for a given trait is:

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a hermaphrodite


Questions 3 of 50

Question:Whether an allele is dominant or recessive depends on:

Answers Choices:

how common the allele is, relative to other alleles

which chromosome it is on

whether or not it is linked to other genes

none of these

Questions 4 of 50

Question:Mendel was a:

Answers Choices:

Plant breeder




Questions 5 of 50

Question:Mendel worked in:

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17th century

18th century

19th century

20th century

Questions 6 of 50

Question:Mendel was born in:

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Silisian village (Heinzendorf)

Questions 7 of 50

Question:Gregor Mendel was born in:

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United Kingdom

Questions 8 of 50

Question:The diploid number of chromosomes in Pisum sativum is:

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Questions 9 of 50

Question:Genes that are present on the same chromosome are called:

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none of these

Questions 10 of 50

Question:The genes for which of the following characters in pea plants are syntenic?

Answers Choices:

Pod texture

Flower location

Plant height

All of these

Questions 11 of 50

Question:The genes for seed colour and flower colour in pea plant are located on the chromosome pair:

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Questions 12 of 50

Question:Considering tallness and dwarfness, tallness is more widespread among pea plants because:

Answers Choices:

Tallness is dominant over dwarfness

Tallness is determined by one gene having many effects

Tallness is determined by many genes hav­ing multiple effects

None of these

Questions 13 of 50

Question:In a monohybrid cross, the genotypic ratio of offsprings is:

Answers Choices:

3 : 1

1 : 2 : 1

1 : 1 : 1 : 1

4 : 0

Questions 14 of 50

Question:When a true-breeding pea plant that has yellow Seeds is pollinated by a plant that has green seeds, all the \({F_1}\) plants have yellow seeds. This means that the allele for yellow is:

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Questions 15 of 50

Question:Recessive gene can express in:

Answers Choices:

homozygous condition

heterozygous condition

both the above conditions

none of these conditions

Questions 16 of 50

Question:When a cross is made between offsprings and its parents, it is known as:

Answers Choices:

Monohybrid cross

Dihybrid cross

Back cross

Reciprocal cross

Questions 17 of 50

Question:Back cross is:

Answers Choices:

\({F_1}\) x \({F_1}\)

\({F_1}\) x Dominant parent

\({F_1}\) x Recessive parent

\({F_1}\) x Any parent

Questions 18 of 50

Question:In a cross 45 tall and 14 dwarf plants were obtained. Genotypes of parents were:

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Tt x tT

TT x Tt


Questions 19 of 50

Question:A test cross distinguishes between:

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two homozygous forms

a homozygous dominant and the hetero­zygous form

two heterozygous forms

a homozygous recessive and heterozygous form

Questions 20 of 50

Question:Mendel's laws of heredity can be explained with the help of:

Answers Choices:



Both mitosis and meiosis

None of the above

Questions 21 of 50

Question:The three principles of Mendelism are:

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Dominance-recessiveness, segregation and independent assortment

Linkage, segregation and independent assortment

Linkage, dominance-recessiveness and segregation

Dominance-recessiveness, linkage and in­dependent assortment

Questions 22 of 50

Question:Mendel's laws apply only when:

Answers Choices:

First pair of contrasting character is depen­dent upon other pairs

Parents are pure breeding

The characters are linked

\({F_1}\) in monohybrid cross shows two types of individuals

Questions 23 of 50

Question:Mendel enunciated principles of inheritance:

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Questions 24 of 50

Question:Who and on which animal the Mendelian laws of inheritance were first confirmed?

Answers Choices:

de Vries on Oenothera

Correns on dog

Morgan on Drosophila

Muller on guinea pig

Questions 25 of 50

Question:Gametes of AaBb individuals can be:

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Aa, Bb

AB, ab

AB, ab, aB

AB, Ab, aB, ab

Questions 26 of 50

Question:A true dihybnd condition is:

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Questions 27 of 50

Question:Ratio in a dihybrid cross is:

Answers Choices:

9 : 2 : 2 : 1

9 : 3 : 3 : 1

1 : 1 : 1 : 1

9 :7

Questions 28 of 50

Question:A cross between plants having YYRR and yyrr composition will yield plants with:

Answers Choices:

round and yellow seeds

round and green seeds

wrinkled and yellow seeds

wrinkled and green seeds

Questions 29 of 50

Question:The dihybrid phenotypic ratio of 9:3:3:1 proves Mendel's law of:

Answers Choices:

independent assortment




Questions 30 of 50

Question:Independent assortment of genes does not take place where:

Answers Choices:

genes are located on homologous chromo­somes

genes are linked and located on the same chromosomes

genes are located on nonhomologous chro­mosomes

all of the above

Questions 31 of 50

Question:Independent assortment means:

Answers Choices:

Recombination of parental characters

Combination of parental characters

Separation of parental characters

Non-separation of parental characters

Questions 32 of 50

Question:In Mirabilis jalapa hybrid between red and white flowered plants produces pink flowers is due to:

Answers Choices:


Incomplete dominance



Questions 33 of 50

Question:In Andalusian fowls, if a cross is made between black fowl and splashed white, what will be the phenotypic ratio in \({{\rm{F}}_2}\):

Answers Choices:

1 : 1 : 2

2 : 1 : 1


1 : 2 : 1

Questions 34 of 50

Question:In case of incomplete dominance, \({F_2}\) generation has:

Answers Choices:

Genotypic ratio 3 : 1

Phenotypic ratio 3 : 1

Genotypic ratio equals phenotypic ratio

None of these

Questions 35 of 50

Question:Inheritance of skin colour in human beings is an example of:

Answers Choices:

Polygenic inheritance

Complementary genes

Mendelian inheritance

Monogenic inheritance

Questions 36 of 50

Question:A polygenic inheritance in human beings is:

Answers Choices:

Colour blindness


Skin colour

Sickle-cell anaemia

Questions 37 of 50

Question:In human beings, height shows a lot of variations. It is an example of:

Answers Choices:


Multiple alleles

Pleiotropic inheritance

Polygenic inheritance

Questions 38 of 50

Question:Gene which suppresses other gene's activity but do not lie on same locus is called as:

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Questions 39 of 50

Question:Epistatic effect in which the dihybrid cross AaBb x AaBb resulting in the ratio 12 : 3 : 1 is due to:

Answers Choices:

interaction between two alleles of the same locus

interaction between two alleles of different loci

dominance of one allele on another allele of the same locus

dominance of one allele on another allele of both loci

Questions 40 of 50

Question:The phenomenon in which an allele of one gene suppresses the activity of an allele of another gene is known as:

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Questions 41 of 50

Question:A mother of blood group O has a group O child. The father could be.

Answers Choices:

A or B

A or B or O

AB only

O only

Questions 42 of 50

Question:How many different genotypes can exist in a population with the dominance hierarchy \({C^ + } > {C^{ch}} > {C^h} > c\) ?

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Questions 43 of 50

Question:Snapdragon flowers can be red (RR), pink (Rr) or white (rr). When red-flowered plants are crossed to white-flowered plants, the possibility of an F2 offspring being homozygous is:

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Questions 44 of 50

Question:Emasculation of flower body is achieved by:

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removal of anthers

removal of carpels

removal of flowers

removal of perianth

Questions 45 of 50

Question:A back cross of the hybrid with the recessive parent is called:

Answers Choices:

test cross

reverse cross

crossing over


Questions 46 of 50

Question:If Mendel had studied the 7 traits using a plant with 12 chromosomes instead of 14, in what way would the interpretation have been different?

Answers Choices:

He would have mapped the chromosome

He would not have discovered the law of independent assortment

He would have discovered blending or incomplete dominance

He would have discovered sex linkage

Questions 47 of 50

Question:What will be the ratio in \({F_2}\) generation if red-flowered variety of Mirabilis jalapa is crossed with white-flowered variety?

Answers Choices:

3 : 1

2 : 2

1 : 2 : 1

1 : 1 : 1 : 1

Questions 48 of 50

Question:If two alleles come together, only one is able to express itself. This is called:

Answers Choices:

Law of incomplete dominance

Law of segregation

Law of dominance

Law of independent assortment

Questions 49 of 50

Question:What proportion of the offspring of the cross AABBcc x AaBbCc will be completely heterozygous if all genes segregate indepen­dently?

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Questions 50 of 50

Question:The complete dominance is absent for the flower colour in:

Answers Choices:

Mirabilis jalapa

Pisum sativum

Lathyrus odoratus

Oenothera lamarckiana