Principles of Inheritance and Variation Test

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Principles of Inheritance and Variation Test - 6

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Question 1
1 / -0

All of the below obeys Mendel’s law except

A
Linkage

B
Independent assortment

C
Dominance

D
Purity of gametes

Solution

Mendel’s laws of inheritance are law of dominance, law of independent assortment and law of segregation. Linkage is responsible for not segregation of traits situated on same chromosome close to each other, so do not follow Mendel’s law.
Question 2
1 / -0

The major reason for the success of Mendelian experiments was

A
Garden pea was cross breeding

B
Garden pea was easily available

C
Garden pea was heterozygous

D
Garden pea was true breeding

Solution

Mendel was successful in his experiments as he selected the garden pea as hybridizing plant which breeds true. He recorded the results statically and observe each trait one by one.
Question 3
1 / -0

Which of the following statements is true regarding the “law of independent assortment”?

A
Independent assortment leads to variation

B
Independent assortment leads to formation of new combinations of characters

C
Factors assort independent of each other when more than one pair of characters are present together

D
All of these

Solution

Law of independent assortment states that factors (genes) assort independent of each other when more than one pair of characters is present together. This conclusion was based on dihybrid cross of Mendel’s experiment.
Question 4
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Two pea plants were subjected cross pollination. Of the 183 plants produced in the next generation, 94 plants were found to be tall and 89 plants were found to be dwarf. The genotypes of the two parental plants are likely to be

A
TT and TT

B
Tt and tT

C
Tt and Tt

D
Tt and tt

Solution

Two pea plants cross pollinated that produce 94 tall plants and 89 dwarf plants. The ratio is about 1:1. This is possible only when both the parents are heterozygous (Tt) although phenotype of both are tall.
Question 5
1 / -0

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 wrinkled seeds with green cotyledons

B
Only wrinkled seeds with yellow cotyledons

C
Round -yellow; wrinkled -yellow; round-green and wrinkled- green

D
Only round seeds with green cotyledons

Solution

The expected Phenotypes in the F2 generation of the cross RRYY x rryy is Round -yellow; wrinkled -yellow; round-green and wrinkled- green in 9:3:3:1 similar to dihybrid results.
Question 6
1 / -0

In a dihybrid cross between AABB and aabb the ratio of AABB, AABb, aaBb, aabb in F2 generation is

A
1: 1: 1: 1

B
1 : 1 : 2

C
9 : 3 : 3: 1

D
1: 2: 2: 1

Solution

Dihybridcross between AABB and aabb results to AaBb in F1 generation. On selfing of AaBb results AABB, AABb, aaBb, aabb in F2 generation in 1:2:2:1 using punnet’s squire method.
Question 7
1 / -0

In a plant, gene "T" is responsible for tallness and its recessive allele "t" for dwarfness and "R" is responsible for red colour flower and its recessive allele "r" of white flower colour. A tall and red flowered plant with genotype TtRr crossed with dwarf and red flowered ttRr. What is the percentage of dwarf - white flowered offspring of above cross?

A
6.25 %

B
12.5 %

C
50 %

D
60 %

Solution

In dihybrid cross, when tall and red flowered plant with genotype TtRr is crossed with dwarf and red flowered tRr the percentage of dwarf-white flower is 12.5% which is about 1/8 of all offspring’s produced.
Question 8
1 / -0

In order to find out the different types of offsprings produced by a pea plant having the genotype AaBb it should be crossed to a plant with the genotype

A
aaBB

B
AaBb

C
AabB

D
AaBB

Solution

Different types of gametes are produced by male and female parts of pea plants. Total four kinds of gametes are produced in dihybrid cross. The AaBb should be crossed with AbBb as the selfing of F1 plants to get the offerings in 9:3:3:1.
Question 9
1 / -0

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

A
4

B
9

C
3

D
2

Solution

The different kinds of gametes produced by genotype AABbCC are ABC and ABc only. During gamete formation, all factors separate from each other and recombine in all possible manner since there is one variation, only two kinds of gametes will be formed.
Question 10
1 / -0

Which one of the following cannot be explained on the basis of Mendel's law of inheritance?

A
The discrete unit controlling a particular character is called a factor

B
Alleles do not show any blending and both the characters recover as such in F2 generation

C
Out of one pair of factors one is dominant, and the other recessive

D
Factors occur in pairs

Solution

Mendel’s law of inheritance cannot explain the blending of alleles during successive generation. Alleles do not show any blending and both characters recovered in F2 generation.

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Principles of Inheritance and Variation Test - 6

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Principles of Inheritance and Variation Test - 6

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SHARING IS CARING

Question 1

Linkage

Independent assortment

Dominance

Purity of gametes

Solution

Question 2

Garden pea was cross breeding

Garden pea was easily available

Garden pea was heterozygous

Garden pea was true breeding

Solution

Question 3

Independent assortment leads to variation

Independent assortment leads to formation of new combinations of characters

Factors assort independent of each other when more than one pair of characters are present together

All of these

Solution

Question 4

TT and TT

Tt and tT

Tt and Tt

Tt and tt

Solution

Question 5

Only wrinkled seeds with green cotyledons

Only wrinkled seeds with yellow cotyledons

Round -yellow; wrinkled -yellow; round-green and wrinkled- green

Only round seeds with green cotyledons

Solution

Question 6

1: 1: 1: 1

1 : 1 : 2

9 : 3 : 3: 1

1: 2: 2: 1

Solution

Question 7

6.25 %

12.5 %

50 %

60 %

Solution

Question 8

aaBB

AaBb

AabB

AaBB

Solution

Question 9

4

9

3

2

Solution

Question 10

The discrete unit controlling a particular character is called a factor

Alleles do not show any blending and both the characters recover as such in F2 generation

Out of one pair of factors one is dominant, and the other recessive

Factors occur in pairs

Solution

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