Heredity and Variation Test 3

Total Questions:50 Total Time: 60 Min

Remaining:

 

Questions 1 of 50

Question:A pair of contrasting characters are known as:

Answers Choices:

segregate genes

homozygotic condition

alleles

none of these

Questions 2 of 50

Question:The contrasting pairs of factors in Mendelian crosses are called:

Answers Choices:

Alloloci

Paramorphs

Multiple alleles

Allelomorphs

Questions 3 of 50

Question:Which of the following characters studied by Mendel in garden pea (Pisum sativum) was dominant?

Answers Choices:

Green pod colour

Green seed colour

Wrinkled seed shape

Terminal tlower position

Questions 4 of 50

Question:Hybrids are generally superior to parents due to:

Answers Choices:

homozygosity

heterozygosity

parents are generally weak

heterosis

Questions 5 of 50

Question:The first scientific study leading to formulations of laws of inheritance was carried out by:

Answers Choices:

Mendel

Lamarck

Hugo de Vries

Darwin

Questions 6 of 50

Question:The first great geneticist was:

Answers Choices:

Miller

Morgan

Darwin

Mendel

Questions 7 of 50

Question:Mendel chose contrasting traits in Pea:

Answers Choices:

4

7

2

3

Questions 8 of 50

Question:How many contrasting traits of pea pod were chosen by Mendel?

Answers Choices:

Seven

Two

Four

Three

Questions 9 of 50

Question:Genes controlling seven traits in pea studied by Mendel were actually located on:

Answers Choices:

4 chromosomes

5 chromosomes

6 chromosomes

7 chromosomes

Questions 10 of 50

Question:Mendel formulated the law of purity of gametes on the basis of:

Answers Choices:

Monohybrid cross

Dihybrid cross

Test cross

Back cross

Questions 11 of 50

Question:An offspring from a cross between two individuals differing in at least one set of characters is called:

Answers Choices:

Mutant

Variant

Hybrid

Polyploid

Questions 12 of 50

Question:How many types of gametes will be required for \({F_2}\) generation of a monohybrid cross of Mendel?

Answers Choices:

2

4

8

16

Questions 13 of 50

Question:A pure tall pea plant is crossed with pure dwarf pea plant. The progeny is self-pollinated. The ratio of true breeding tall pea plants to true breeding dwarf pea plants shall be:

Answers Choices:

1 : 1

2 : 1

1 : 2

3 : 1

Questions 14 of 50

Question:In human beings, brown eye (B) is dominant over blue eye (b) A brown eyed couple has a blue-eyed child. What is the possible genotype of the couple?

Answers Choices:

Bb x bb

Bb x bB

BB x bb

BB x bB

Questions 15 of 50

Question:Pure red flowered and white flowered plants were crossed. It produced 120 offsprings with:

Answers Choices:

All red flowered ,

90 white flowered and 30 red flowered

90 red flowered and 30 white flowered

60 red flowered and 60 white flowered

Questions 16 of 50

Question:Mendel's law is still true because:

Answers Choices:

it takes place in sexually reproducing plants

it takes place in asexually reproducing plants

it takes place in both reproducing plants

it takes place in apomictic reproducing plants

Questions 17 of 50

Question:Mendel's principle of segregation was based on the separation of alleles in the garden pea during:

Answers Choices:

pollination

embryonic development

seed formation

gamete formation

Questions 18 of 50

Question:Gametes are never hybrids. This is a statement of:

Answers Choices:

law of segregation

law of dominance

law of random fertilization

law of independent assortment

Questions 19 of 50

Question:Ratio 9 : 3 : 3 : 1 is due to:

Answers Choices:

Dihybrid cross

Monohybrid cross

Lethal genes

Duplicate genes

Questions 20 of 50

Question:Organism heterozygous for two genes shall be:

Answers Choices:

RRYY

RrYY

RRYy

RrYy

Questions 21 of 50

Question:RrYy yields gamete types:

Answers Choices:

One

Two

Three

Four

Questions 22 of 50

Question:Mendel's second law is:

Answers Choices:

Independent assortment

Dominance

Polygenic inheritance

Segregation

Questions 23 of 50

Question:Had Mendel decided to study those traits gether which are determined by linked genes, he would not have found out:

Answers Choices:

Principle of segregation

Crossing over

Principle of independent assortment

Dominance

Questions 24 of 50

Question:Mendel's law of independent assortment is based on \({{\rm{F}}_{\rm{2}}}\) ratio of:

Answers Choices:

1 : 2 : 1

2 : 1

3 : 1

9 : 3 : 3 : 1

Questions 25 of 50

Question:A dwarf pea plant was treated with gibberellic acid. It grows as a pure tall pea plant. If the treated plant is crossed with a pure tall plant, the phenotypic ratio of \({F_1}\)is likely to be:

Answers Choices:

All tall

All dwarf

75% tall, 25% dwarf

50% tall, 50% dwarf

Questions 26 of 50

Question:A series of self-breeding generations having homozygous genotypes is called:

Answers Choices:

Phenocopy

Pure line

Hybrid

Heterozygote

Questions 27 of 50

Question:Incomplete dominance is found in:

Answers Choices:

Pisum sativum

Antirrhinum majus

Both Pisum sativum and Antirrhinum majus

None of these

Questions 28 of 50

Question:How many possible genotypes are there for the ABO blood groups?

Answers Choices:

Sixteen

Eight

Six

Four

Questions 29 of 50

Question:A child with blood group genotype \({{\rm{I}}^{\rm{A}}}{{\rm{I}}^{\rm{B}}}\) is born of a woman with genotype \({{\rm{I}}^{\rm{B}}}{{\rm{I}}^{\rm{B}}}\). The father could not be a man of genotype:

Answers Choices:

\({{\rm{I}}^{\rm{A}}}{{\rm{I}}^{\rm{A}}}\)

\({{\rm{I}}^{\rm{B}}}{{\rm{I}}^{\rm{B}}}\)

\({{\rm{I}}^{\rm{A}}}{{\rm{I}}^{\rm{B}}}\)

Ia Io

Questions 30 of 50

Question:A man with blood group B marries a woman with blood group A and their first child is having group B. What is the genotype of the child?

Answers Choices:

\({{\rm{I}}^{\rm{A}}}{{\rm{I}}^{\rm{B}}}\)

\({{\rm{I}}^{\rm{B}}}{{\rm{I}}^{\rm{B}}}\)

\({{\rm{I}}^{\rm{B}}}i\)

\({{\rm{I}}^{\rm{A}}}{\rm{i}}\)

Questions 31 of 50

Question:Genes A and B are necessary for normal hearing. What is the possible genotype of a normal child of deaf mother/father?

Answers Choices:

Aabb

aabb

aaBB

AaBb

Questions 32 of 50

Question:\({{\rm{F}}_{\rm{2}}}\) generation of a cross between two white flowered strains of sweet pea yields 9 purple flowered plants : 7 white flowered plants. This is an example of:

Answers Choices:

Gene inhibition

Epistasis

Complementary genes

Supplementary genes

Questions 33 of 50

Question:How many types of genotypes are formed in \({{\rm{F}}_2}\) progeny obtained from self pollination of a dihybrid \({{\rm{F}}_1}\) ?

Answers Choices:

9

3

6

1

Questions 34 of 50

Question:In a dihybrid cross, \({{\rm{F}}_2}\) ratio of 15 : 1 is due to:

Answers Choices:

Supplementary genes

Duplicate genes

Recessive epistasis

Dominant epistasis

Questions 35 of 50

Question:Sickle-cell anaemia is one of the good examples for :

Answers Choices:

Epistasis

Pleiotrophy

Codominance

Incomplete dominance

Questions 36 of 50

Question:Pleiotropy occurs when a gene has:

Answers Choices:

a complementary gene elsewhere

a small effect on one trait

reversible effects on the phenotype

many effects on the phenotype

Questions 37 of 50

Question:The horse (Equus caballus) has a diploid com­plement of 64 chromosomes including 36 acrocentric autosomes; the ass (Equus asinus) has 62 chromosomes including 22 acrocentric autosomes. Predict the number of chromosomes to be found in the hybrid offspring (mule) produced by mating a male ass (jack) to a female horse (mare):

Answers Choices:

64

63

33

36

Questions 38 of 50

Question:The ABO blood groups of humans are determined by three alleles. How many genotypes are possible for these phenotypes?

Answers Choices:

3

4

6

8

Questions 39 of 50

Question:When female albino plant of maize is crossed with male green plant, all progeny is albino due to:

Answers Choices:

mutation in plastids

plastid inheritance

albino is a dominant trait

none of these

Questions 40 of 50

Question:Skin colour of human beings is determined by cumulative genes. This hypothesis was pro­posed by:

Answers Choices:

Davenport

Correns

Bateson

Sutton

Questions 41 of 50

Question:In a certain plant, red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over dwarfness (t). If a plant with RRTt geno­type is crossed with a plant that is rrtt, what will be the percentage of tall plants with red fruits in the progeny?

Answers Choices:

100%

25%

50%

75%

Questions 42 of 50

Question:A tobacco plant heterozygous for albinism (a recessive character) is self-pollinated and 1200 seeds are subsequently germinated. How many seedlings would have parental genotype

Answers Choices:

All

300

600

None of these

Questions 43 of 50

Question:How many phenotypes will be obtained from a test cross of AaBbCc?

Answers Choices:

16

8

32

4

Questions 44 of 50

Question:Which of the following demonstrates the 'law of independent assortment'?

Answers Choices:

Monohybrid cross

Test cross

Trihybrid cross

Back cross

Questions 45 of 50

Question:If a homozygous dominant red-flowered plant is crossed with a homozygous recessive white-flowered plant, the offsprings would be:

Answers Choices:

Half red-flowered

Half pink-flowered

Half white-flowered

All red-flowered

Questions 46 of 50

Question:In Mendelism, linkage was not observed due to:

Answers Choices:

independent assortment

crossing over

mutation

synapsis

Questions 47 of 50

Question:The dihybrid test cross ratio is:

Answers Choices:

9 : 3 : 4

1 : 1

1 : 1 : 1 : 1

3 : 1

Questions 48 of 50

Question:A plant of \({F_1}\) generation with genotype AABbCC. On selfing of this plant what is the phenotypic ratio in \({F_2}\) generation?

Answers Choices:

9:3:3:1

1:1

27:9:9:9:3:3:3:1

3:1

Questions 49 of 50

Question:A monohybrid cross between two plants, one having 24 cm long internodes and the other having 12 cm internodes produced \({F_1}\) hybrids all having 18 cm long internodes. This is a case of:

Answers Choices:

multiple allelism

complete dominance

recessive dominance

incomplete dominance

Questions 50 of 50

Question:In Mirabilis jalapa, TT, Tt, tt determine red, pink and white colour respectively. When \({F_1}\) hybrid got from TT and tt was crossed with TT, ratio produced is:

Answers Choices:

All red

2 red : 2 pink

All white

2 pink : 2 white