Principles of Inheritance and Variation Test

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Principles of Inheritance and Variation Test - 76

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Weekly Quiz Competition

Question 1
1 / -0

The trait traced in this pedigree is

A
X linked recessive

B
X linked dominant

C
Autosomal recessive

D
Autosomnal dominant

Solution

Characteristic features of Autosomal Dominant gene inheritance:-
• Appears in both sexes with equal frequency
• Both sexes transmit the trait to their offspring
• Does not skip generations
• Affected offspring must have an affected parent unless they posses a new mutation.
• When one parent is affected (het.) and the other parent is unaffected, approx. 1/2 of the offspring will be affected
• Unaffected parents do not transmit the trait.

So the correct option is 'Autosomal dominant'.
Question 2
1 / -0

When a pure bred, red flower -producing plant of genotype RR is crossed with pure bred , white flowers-producing plant of genotype rr,all the $${ F }_{ 1 }$$ plants produced pink flowers If all the plant in each generation from $${ F }_{ 1 }$$ to$${ F }_{ 6 }$$ are selfed, what will be the percentage of plants with red and white flowers in the final population of plants with red and white flowers in the final population consisting of a large number of individuals? (Consider that flowers colour has no effect on reproduction and survival.)

A
$$3-4$$

B
$$12-13$$

C
$$49-51$$

D
$$97-100$$

Solution

R r
R RR Rr
r Rr rr
RR (Purebred red flower producing plant) x rr (Purebred white flower producing plant) produce Rr (Pink flower producing plant)
When selfing is done,
RR is produced, which produce the Purebred red flower.
Rr is produced, which produce a pink flower.
rr is produced, which produce a Purebred white flower.
Thus, the correct answer is '3 - 4.'
Question 3
1 / -0

A couple has $$8$$ children, all boys. What is the chance that their ninth child will be another boy?

A
$$1/2$$

B
$$1/4$$

C
$$1/8$$

D
$$1/16$$

Solution

Mother produces one type of gamete containing X chromosome. Father produces two types of gametes, containing X or Y chromosome. Hence, there are 1/2 chances of gamete with X chromosome mating with male gamete with X chromosome. Similarly, there are 1/2 chances of female gamete with X chromosome mating with male gamete with Y chromosome. Hence, there are 1/2 chances that their child will be a boy.
So, the correct answer is '1/2'
Question 4
1 / -0

Trace the trait in this pedigree-

A
X-linked dominant

B
X linked recessive

C
Autosomnal dominant

D
Autosomal recessive

Solution

If the disorder is dominant, one of the parents must have the disorder. Both males and females are affected; often more females than males are affected in case of sex linked dominant inheritance. Following properties are that of the X linked inheritance pattern:
a) Does not skip generations, b) Affected sons must have an affected mother, c) Affected daughters must have either an affected mother or an affected father, d) Affected fathers will pass the trait on to all their daughters.
All of these are applicable in this case of the pedigree chart.
So, the correct option is 'X-linked dominant'.
Question 5
1 / -0

Mutation is

A
A change that is inherited

B
A change, which affects the parents only but never, inherited

C
A change, which affects the offspring of $$F2$$ generation only

D
A factor responsible for plant growth

Solution

Mutation can be defined as the sudden changes in the DNA that are heritable. This change is permanent. If it confers favourable character to the individuals, then it is fixed by the process of natural selection. If it results in loss of function of the gene, it leads to the genetic disorders. Hence, the correct answer is 'A change that is inherited'
Question 6
1 / -0

The grain colour of wheat is determine by the additive effects of two pairs of genes Accordingly the $$F_2$$ inhertance appears in the ratio of $$15$$ red ,$$1$$ white the fifteen red appear in different shades in the ratio of

A
$$9:3:3$$

B
$$6:6:3$$

C
$$1:4:7:3$$

D
$$1:4:6:4$$

Solution

The above case shows the incomplete dominance case. Incomplete dominance refers to a genetic situation in which one allele does not completely dominate another allele and therefore results in a new phenotype. This can be observed by the red color variation in the population.
So the correct option is '9:3:3'.
Question 7
1 / -0

Given pedigree chart represents

A
Autosomal recessive trait

B
Sex linked dominant trait

C
Sex linked recessive trait

D
Autosomal dominant trait
Question 8
1 / -0

In the given pedigree, identify whether the shaded symbols indicate dominant or recessive allele?

A
Recessive

B
Codominant

C
Dominant

D
It can be recessive or dominant both
Solution
- In the pedigree chart, in the first generation the disease is transmit from the father to all the progenies which show the allele as dominant.
- But in the second generation, when an affected female is crossed with a normal male only one daughter is affected while the other two are normal which shows that the allele is recessive.
So the correct option is option D.
Question 9
1 / -0

Which of the following scientists rediscover Mendel's work?

A
Correns, Bateson, Tschermak

B
Correns, De vries, Tschermak

C
De vries, Morgan, Tschermak

D
Correns, Tschermak, Garrod
Solution
Correct Option: B
Explanation:

In 1990, three scientists (Correns, de Vries and Von Tschermak) independently rediscovered Mendel's results on the inheritance of character.
So the correct answer is "Correns, de Vries and Von Tschermak".
Question 10
1 / -0

25:46:26 is the genotypic ratio in $${ F }_{ 2 }$$ generation is expected from which parental cross?

A
$$Aa \times Aa$$

B
$$AA \times Aa$$

C
$$Aa \times aa$$

D
$$AA \times AA$$

Solution

A genotypic ratio of 25:46:26 is an approximately ratio of 1:2:1. When we draw a cross between Aa x Aa, we will get a progeny having genotype AA, Aa, aa in a ratio of 1:2:1 approximately.
Thus, the correct answer is 'Aa×Aa.'

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Re-Attempt Weekly Quiz Competition

Principles of Inheritance and Variation Test - 76

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Principles of Inheritance and Variation Test - 76

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SHARING IS CARING

Question 1

X linked recessive

X linked dominant

Autosomal recessive

Autosomnal dominant

Solution

Question 2

$$3-4$$

$$12-13$$

$$49-51$$

$$97-100$$

Solution

Question 3

$$1/2$$

$$1/4$$

$$1/8$$

$$1/16$$

Solution

Question 4

X-linked dominant

X linked recessive

Autosomnal dominant

Autosomal recessive

Solution

Question 5

A change that is inherited

A change, which affects the parents only but never, inherited

A change, which affects the offspring of $$F2$$ generation only

A factor responsible for plant growth

Solution

Question 6

$$9:3:3$$

$$6:6:3$$

$$1:4:7:3$$

$$1:4:6:4$$

Solution

Question 7

Autosomal recessive trait

Sex linked dominant trait

Sex linked recessive trait

Autosomal dominant trait

Question 8

Recessive

Codominant

Dominant

It can be recessive or dominant both

Solution

Question 9

Correns, Bateson, Tschermak

Correns, De vries, Tschermak

De vries, Morgan, Tschermak

Correns, Tschermak, Garrod

Solution

Question 10

$$Aa \times Aa$$

$$AA \times Aa$$

$$Aa \times aa$$

$$AA \times AA$$

Solution

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