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Principles of Inheritance and Variation · Question 83

NEET 2013 (Karnataka)MCQEasy📈 Topic in 50% papers+4−1
1

Which one is the incorrect statement with regards to the importance of pedigree analysis?

  1. It confirms that DNA is the carrier of genetic information
  2. It helps to trace the inheritance of a specific trait
  3. It confirms that the trait is linked to one of the autosome
  4. It helps to understand whether the trait in question is dominant or recessive

Answer

(1) It confirms that DNA is the carrier of genetic information

Solution

As per NCERT, the analysis of traits in several generations of a family is called pedigree analysis; the inheritance of a particular trait is represented in the family tree over generations.

⇒ It helps to trace the inheritance of a specific trait and to find whether the trait is dominant or recessive, and autosomal or sex-linked.

⇒ That DNA is the genetic material was proved by experiments such as those of Avery, MacLeod and McCarty and of Hershey and Chase, not by pedigree analysis.

∴ Statement (1) is incorrect.

Answer: (1)

NEET 2013 (Karnataka)

Keep practising — Principles of Inheritance and Variation

2

Down's syndrome in humans is due to :

  1. Three 'X' chromosomes
  2. Monosomy
  3. Three copies of chromosome 21
  4. Two 'Y' chromosomes
NEET 2013 (Karnataka)
3

Represented below is the inheritance pattern of a certain type of traits in humans. Which one of the following conditions could be an example of this pattern ? [figure]

  1. Haemophilia
  2. Sickle cell anaemia
  3. Thalassemia
  4. Phenylketonuria
AIPMT 2012 (Mains)
4

A test cross is carried out to :

  1. Determine whether two species or varieties will breed successfully
  2. Determine the genotype of a plant at F2
  3. Predict whether two traits are linked
  4. Assess the number of alleles of a gene
AIPMT 2012 (Mains)
5

Which one of the following is a wrong statement regarding mutations ?

  1. UV and gamma rays are mutagens
  2. Deletion and insertion of base pairs cause frame-shift mutations
  3. Cancer cells commonly show chromosomal aberrations
  4. Change in a single base pair of DNA does not cause mutation
AIPMT 2012 (Mains)
6

A normal-visioned man whose father was colour-blind, marries a woman whose father was also colour-blind. They have their first child as a daughter. What are the chances that this child would be colour-blind ?

  1. 50%
  2. 25%
  3. 100%
  4. Zero percent
AIPMT 2012 (Prelims)
7

F2 generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as 1 : 2 : 1. It represents a case of

  1. Monohybrid cross with incomplete dominance
  2. Co-dominance
  3. Monohybrid cross with complete dominance
  4. Dihybrid cross
AIPMT 2012 (Prelims)
8

Which one of the following conditions of the zygotic cell would lead to the birth of a normal human female child?

  1. only one Y chromosome
  2. only one X chromosome
  3. one X and one Y chromosome
  4. two X chromosomes
AIPMT 2011 (Mains)
9

Test cross in plants or in Drosophila involves crossing:

  1. the F1 hybrid with a double recessive genotype
  2. between two genotypes with dominant trait
  3. between two F1 hybrids
  4. between two genotypes with recessive trait
AIPMT 2011 (Mains)
10

Which one of the following conditions correctly describes the manner of determining the sex ?

  1. XO condition in humans as found in Turner Syndrome, determines female sex
  2. XO type of sex chromosomes determine male sex in grasshopper
  3. Homozygous sex chromosomes (ZZ) determine female sex in Birds
  4. Homozygous sex chromosomes (XX) produce male in Drosophila
AIPMT 2011 (Prelims)
11

Mutations can be induced with :

  1. Gamma radiation
  2. Infra Red radiations
  3. IAA
  4. Ethylene
AIPMT 2011 (Prelims)

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