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Test: Pedigree Analysis (NCERT)


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10 Questions MCQ Test Biology Class 12 | Test: Pedigree Analysis (NCERT)

Test: Pedigree Analysis (NCERT) for NEET 2022 is part of Biology Class 12 preparation. The Test: Pedigree Analysis (NCERT) questions and answers have been prepared according to the NEET exam syllabus.The Test: Pedigree Analysis (NCERT) MCQs are made for NEET 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Pedigree Analysis (NCERT) below.
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Test: Pedigree Analysis (NCERT) - Question 1

Inheritance of which of the following traits is shown in the given cross?

Detailed Solution for Test: Pedigree Analysis (NCERT) - Question 1
  • In the given cross, passing of disease is from carrier female to male progeny (criss-cross inheritance). Any trait that shows criss-cross inheritance is located on the sex chromosome.
  • Presence of a single recessive gene i.e. Xc in carrier individuals (XXC) does not cause the disease, thus the trait is recessive.
Test: Pedigree Analysis (NCERT) - Question 2

Which one is the incorrect match?

Detailed Solution for Test: Pedigree Analysis (NCERT) - Question 2

It denotes a female

Test: Pedigree Analysis (NCERT) - Question 3

Study the given pedigree chart showing the inheritance of an X-linked trait controlled by gene 'r'

What will be the genotypes of individuals A, B, C and D respectively?

Detailed Solution for Test: Pedigree Analysis (NCERT) - Question 3

Genotypes of different individuals in the given pedigree chart can be illustrated as:

Test: Pedigree Analysis (NCERT) - Question 4

Select the incorrect statement regarding pedigree analysis

Detailed Solution for Test: Pedigree Analysis (NCERT) - Question 4

In pedigree analysis, solid symbol shows affected individuals.

Test: Pedigree Analysis (NCERT) - Question 5

In humans, polydactyly (i.e, presence of extra fingers and toes) is determined by a dominant autosomal allele (P) and the normal condition is determined by a recessive allele (p). Find out the possible genotypes of family members 1, 2 and 3 in the given pedigree.

Codes are:

Detailed Solution for Test: Pedigree Analysis (NCERT) - Question 5

Given pedigree chart for polydactyly (autosomal dominant trait) can be explained as follows :

Test: Pedigree Analysis (NCERT) - Question 6

Fused ear lobes appear in the progeny due to an autosomal recessive gene. Work out the genotypes of members in the given pedigree.

Detailed Solution for Test: Pedigree Analysis (NCERT) - Question 6

Given pedigree chart for fused ear lobes (autosomal recessive trait) can be explained as follows:

Test: Pedigree Analysis (NCERT) - Question 7

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

Detailed Solution for Test: Pedigree Analysis (NCERT) - Question 7

The given trait cannot be sex-linked as sex-linked traits follow criss-cross inheritance and in the given pedigree, no criss-cross inheritance is being followed. The trait exhibited in pedigree chart is autosomal recessive. An autosomal recessive trait appears in case of marriage between two heterozygous individuals (Aa x Aa=3Aa+1aa), a recessive individual with hybrid (Aa x aa=2Aa+2aa) and two recessives (aa x aa= all aa). It expresses its effect only in pure or homozygous state.

If the trait had been controlled by dominant gene, then one of the parent must have possessed the dominant gene and hence the disease.

Test: Pedigree Analysis (NCERT) - Question 8

Given pedigree chart depicts the inheritance of attached ear lobes, an autosomal recessive trait.

Which of the following conclusions drawn is correct?

Detailed Solution for Test: Pedigree Analysis (NCERT) - Question 8

Given pedigree can be illustrated as follows:

Test: Pedigree Analysis (NCERT) - Question 9

Study the pedigree chart of a family showing the inheritance of myotonic dsytrophy

The trait under study is

Detailed Solution for Test: Pedigree Analysis (NCERT) - Question 9

Autosomal domionant trait can express its effect in homozygpous as well as heterzygous condition.

Test: Pedigree Analysis (NCERT) - Question 10

If A = normal allele, a = albino allele, then genotypes of father and mother respectively are?

Detailed Solution for Test: Pedigree Analysis (NCERT) - Question 10

Albinism is hereditary lack of pigmentation in an organism. It is an autosomal recessive disorder. Albino humans lack dark pigment melanin in their skin, hair or eyes. The allele responsible is recessive to allele for normal pigmentation. Father's and mother's genotype should be Aa. They both are carriers of the disease.

The chances of this couple's fifth child being an albino are 1 in 4.

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