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Principles of Inheritance and Variation Mock Test-3

Question No:1

Which of the following depicts the Mendel’s dihybrid ratio?

[A] 3:1
[B] 9:3:3:1
[C] 9:7
[D] 15:1



Question No:2

In dihybrid cross, out of 16 plants obtained, the number of genotypes will be

[A] 4
[B] 9
[C] 16
[D] 12



Question No:3

Pure homozygous off springs in a dihybrid cross in the F2 generation will be

[A] 1/2
[B] 1/4
[C] 1/8
[D] 1/16



Question No:4

In hybridization, Tt x tt gives rise to the progeny of ratio

[A] 1:1
[B] 1:2
[C] 2:1
[D] 1:2:1



Question No:5

Self-pollination between Tt and Tt plants results into genotype ratio of

[A] 3:1
[B] 1:2:1
[C] 1:3
[D] 4:0



Question No:6

Mendel crossed a pure white-flowered recessive pea plant with a dominant pure red-flowered plant. The first generation of hybrids from the cross should show

[A] 50% white-flowered and 50% red-flowered plants
[B] All red-flowered plants
[C] 75% red-flowered and 25% white-flowered plants
[D] All white-flowered plants



Question No:7

If in a dihybrid cross, Mendel had used two such characters which have linked, he would have faced difficulty in explaining the results on the basis of his

[A] Law of segregation
[B] Law of multiple factor hypothesis
[C] Law of independent assortment
[D] Law of dominance



Question No:8

From a cross Aa BB x aa BB, following genotypic ratio will be obtained in F1 generation

[A] 1 Aa BB : 1 aa BB
[B] AaBB:3 aa BB
[C] 3 Aa BB: 1 aa BB
[D] All Aa BB: No aa BB



Question No:9

A farmer crossed a walnut combed chicken with a single combed one and obtained all walnut combed chickens in Fl. The genotype of the parents was

[A] RrPp x rrpp
[B] RRPP x rrpp
[C] RR pp x rr pp
[D] RR Pp x rr pp



Question No:10

In sweet peas, genes C and P are necessary for colour in flowers. The flowers are white in the absence of either or both the genes. What will be the percentage of coloured flowers in the offspring of the cross Cc pp x cc Pp

[A] 100%
[B] 75%
[C] 25%
[D] 50%



Question No:11

In a monohybrid cross, 120 plants are obtained. The ratio of homozygous and heterozygous will be

[A] 40:80
[B] 60:60
[C] 20:100
[D] 10:110



Question No:12

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

[A] He could have mapped the chromosome
[B] He would have discovered blending or incomplete dominance
[C] He would not have discovered the law of independent assortment
[D] He would have discovered sex linkage



Question No:13

How many different types of genetically different gametes will be produced by a heterozygous plant having the genotype AA Bb Cc?

[A] Two
[B] Four
[C] Six
[D] Nine



Question No:14

Mendel’s law of independent assortment is applicable for

[A] All genes in all organisms
[B] All genes of pea plant only
[C] All linked genes only
[D] All non-linked genes only



Question No:15

In a plant, red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTt genotype is crossed with a plant that is rrtt, then

[A] 75% will be tall with red fruit
[B] All the offspring will be tall with red fruit
[C] 25% will be tall with red fruit
[D] 50% will be tall with red fruit