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Principles of Inheritance and Variation · Question 57

NEET 2017MCQEasy📈 Topic in 50% papers+4−1
1

Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement.

  1. Both are due to a qualitative defect in globin chain synthesis
  2. Thalassemia is due to less synthesis of globin molecules
  3. Sickle cell anemia is due to a quantitative problem of globin molecules
  4. Both are due to a quantitative defect in globin chain synthesis

Answer

(2) Thalassemia is due to less synthesis of globin molecules

Solution

As per NCERT, thalassemia differs from sickle-cell anaemia in that the former is a quantitative problem of synthesising too few globin molecules, while the latter is a qualitative problem of synthesising an incorrectly functioning globin.

⇒ Thalassemia: mutation/deletion reduces the rate of synthesis of α or β globin chains (less globin).

⇒ Sickle-cell anaemia: substitution of Glu by Val at the 6th position of the β-globin chain (abnormal globin).

∴ Thalassemia is due to less synthesis of globin molecules.

Answer: (2)

NEET 2017

Keep practising — Principles of Inheritance and Variation

2

The genotypes of a Husband and Wife are IAIB and IAi. Among the blood types of their children, how many different genotypes and phenotypes are possible?

  1. 4 genotypes ; 3 phenotypes
  2. 4 genotypes ; 4 phenotypes
  3. 3 genotypes ; 4 phenotypes
  4. 3 genotypes ; 3 phenotypes
NEET 2017
3

A disease caused by an autosomal primary non-disjunction is :

  1. Klinefelter's Syndrome
  2. Down's Syndrome
  3. Turner's Syndrome
  4. Sickle Cell Anemia
NEET 2017
4

Which one from those given below is the period for Mendel's hybridisation experiments ?

  1. 1870 – 1877
  2. 1857 – 1869
  3. 1840 – 1850
  4. 1856 – 1863
NEET 2017
5

Among the following characters, which one was not considered by Mendel in his experiments on pea?

  1. Stem-Tall or dwarf
  2. Pod-Inflated or constricted
  3. Trichomes-Glandular or non-glandular
  4. Seed-Green or yellow
NEET 2017
6

A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at telophase stage. There is no formation of cell plate and thus the cell is containing more number of chromosomes as compared to other dividing cells. This would result in -

  1. Polyteny
  2. Aneuploidy
  3. Polyploidy
  4. Somaclonal variation
NEET 2016 (Phase 1)
7

Pick out the correct statements :

  1. A, B and C only
  2. A, C and D only
  3. A and D only
  4. B and D only
NEET 2016 (Phase 1)
8

A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F1 plants were selfed the resulting genotypes were in the ratio of -

  1. 3 : 1 :: Tall : Dwarf
  2. 1 : 2 : 1 :: Tall heterozygous : Tall homozygous : Dwarf
  3. 1 : 2 : 1 :: Tall homozygous : Tall heterozygous : Dwarf
  4. 3 : 1 :: Dwarf : Tall
NEET 2016 (Phase 1)
9

Match the terms in Column-I with their description in Column-II and choose the correct option :

  1. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
  2. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
  3. (a)-(ii), (b)-(ii), (c)-(iv), (d)-(iii)
  4. (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
NEET 2016 (Phase 1)
10

In a testcross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates

  1. Both of the characters are controlled by more than one gene
  2. The two genes are linked and present on the same chromosome
  3. The two genes are located on two different chromosomes
  4. Chromosomes failed to separate during meiosis
NEET 2016 (Phase 1)
11

Which of the following most appropriately describes haemophilia ?

  1. Chromosomal disorder
  2. X-linked recessive gene disorder
  3. Dominant gene disorder
  4. Recessive gene disorder
NEET 2016 (Phase 1)

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All NEET Botany chapters
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