Principles of Inheritance and Variation Test

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Principles of Inheritance and Variation Test - 97

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Weekly Quiz Competition

Question 1
1 / -0

Given are some organisms.
(I) Fowl (II) Humans (III) Grasshopper
Following alphabets related to the given animals.
Male homogametic - A
Female heterogametic -B
Male heterogametic - C
Female homogametic - D
Which of the following options correctly describes the given animals in terms of sex determination?

A
(I) A, B (II) C, D (III) C, D

B
(I) C, D (II) A, B (III) C, D

C
(I) A, D (II) C, D (III) A, D

D
(I) B, C (II) C, D (III) A, B

Solution

1) Fowl belongs to ZZ-ZW pattern- In this female is heterogametic while the male possesses two homomorphic chromosomes.
2) Humans belong to XX-XY pattern- Here the male possess one X and one Y chromosome means male is heterogametic while female possesses two homomorphic X-chromosomes.
3) Grasshopper belong to XX-XO pattern- Here the female has two X chromosomes(called XX), and mail has only one X-chromosomes(male heterogametic).
So, the correct option is '(I)A,B (II)C,D (III)C,D'.
Question 2
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What proportion of the $$f1$$ generation will be short will wrinkled seeds when pure tall round plant is crossed with pure dwarf wrinkled seeded plant?

A
None

B
$$25\%$$

C
$$50\%$$

D
$$75\%$$

Solution

At the point when a couple of differentiating characters is available together, just a single quality shows up in the original. This communicated quality is called the prevailing characteristic and the unexpressed attribute is known as the latent characteristic. For instance, when Mendel crossed an unadulterated breed tall pea plant with an unadulterated breed predominate plant. He found that every one of the plants in the F1 age was tall. That implies, just stature attribute showed up in the F1 age. Subsequently, it was the prevailing quality while dwarfness was the latent attribute.
So, the correct option is 'None'.
Question 3
1 / -0

The color based constrasting traits in seven constrasting pairs,studied by Mental in pea plant were

A
1

B
2

C
3

D
4
Question 4
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Under which title was Mendel's work published in Natural History Society of Brunn?

A
Mendel's laws of inheritance

B
Experiments on plants Hybridization

C
Experiment on Heredity and variation

D
Origin of species

Solution

Gregor Mendel, through his work on pea plants, discovered the fundamental laws of inheritance. He deduced that genes come in pairs and are inherited as distinct units, one from each parent. Mendel tracked the segregation of parental genes and their appearance in the offspring as dominant or recessive traits.
So, the correct option is 'Experiments on Plant hybridization'.
Question 5
1 / -0

Above pedigree chart represent

A
Autosomal recessive trait

B
Sex linked dominant trait

C
Sex linked recessive trait

D
Autosomal dominant trait
Question 6
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above in image

A
Autosomal dominant

B
X-Linked dominant

C
Autosomal recessive

D
X-Linked recessive
Question 7
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Which of the following law was discovered first by Mendel?

A
Law of dominance

B
Law of segregation

C
Law of independent assortment

D
Law of sex determination
Question 8
1 / -0

If two genes 'a' and 'b' are linked and show 20% recombination, the proportion of gemetes produced in $$F_1$$ by a dihybrid ++/ab derived from a cross between ++/++ and ab/ab would be

A
++ 20% : ab 20% : + a 20% : +b 20%

B
++ 80% : ab 20%

C
++ 50% : ab 50%

D
++ 40% : ab 40% : +a 10% : +b 10%

Solution

As per the question, 20% recombination is present in genes 'a' and 'b' , so this shows 20% crossover and thus resultant progeny will be recombinants of both the parents. The linkage percentage here is 80% that means there will be 40% chances for progeny to be identical to both the parents.
So the correct answer is ' D'.
Question 9
1 / -0

Consider the given pedigree and select the correct option regarding the affected individuals.

A
It is an autosomal recessive trait

B
It is a sex-linked dominant trait

C
It is an autosomal dominant trait

D
It is a sex-linked recessive trait
Question 10
1 / -0

In the following pedigree chart, the mutant trait is shaded black. The gene responsible for the trait is?

A
Dominant and X-linked

B
Dominant and autosomal or dominant and X-linked

C
Recessive and X-linked

D
Recessive and Y-linked