PYQSide ExamsMy practice

Principles of Inheritance and Variation · Question 106

AIPMT 2009MCQMedium📈 Topic in 50% papers+4−1
1

Study the pedigree chart given below: [figure] What does it show?

  1. Inheritance of a recessive sex-linked disease like haemophilia
  2. Inheritance of a sex-linked inborn error of metabolism like phenylketonuria
  3. The pedigree chart is wrong as this is not possible
  4. Inheritance of a condition like phenylketonuria as an autosomal recessive trait

Answer

(4) Inheritance of a condition like phenylketonuria as an autosomal recessive trait

Solution

Unaffected parents in generation I have an affected son and an affected daughter ⇒ the trait is recessive (both parents are carriers).

⇒ An affected daughter from an unaffected father rules out X-linked recessive inheritance (her father would have to be affected).

⇒ In generation III, unaffected parents again have an affected son ⇒ both are carriers.

∴ The trait is autosomal recessive, like phenylketonuria (PKU is an autosomal recessive inborn error of metabolism, not sex-linked).

Answer: (4)

AIPMT 2009

Keep practising — Principles of Inheritance and Variation

2

Which one of the following conditions in humans is correctly matched with its chromosomal abnormality/linkage?

  1. Klinefelter's syndrome — 44 autosomes + XXY
  2. Colour-blindness — Y-linked
  3. Down syndrome — 44 autosomes + XO
  4. Erythroblastosis foetalis — X-linked
AIPMT 2008
3

Haploids are more suitable for mutation studies than the diploids. This is because:

  1. all mutations, whether dominant or recessive are expressed in haploids
  2. mutagens penetrate in haploids more effectively than in diploids
  3. haploids are reproductively more stable than diploids
  4. haploids are more abundant in nature than diploids
AIPMT 2008
4

A human male produces sperms with the genotypes AB, Ab, aB, and ab pertaining to two diallelic characters in equal proportions. What is the corresponding genotype of this person?

  1. AaBb
  2. AABB
  3. AaBB
  4. AABb
AIPMT 2007
5

In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow and green seeded plants would you expect in F1 generation?

  1. 9 : 1
  2. 3 : 1
  3. 50 : 50
  4. 1 : 3
AIPMT 2007
6

Inheritance of skin colour in humans is an example of:

  1. Chromosomal aberration
  2. Polygenic inheritance
  3. Codominance
  4. Point mutation
AIPMT 2007
7

In the hexaploid wheat, the haploid (n) and basic (x) numbers of chromosomes are:

  1. n = 21 and x = 14
  2. n = 21 and x = 21
  3. n = 7 and x = 21
  4. n = 21 and x = 7
AIPMT 2007
8

A common test to find the genotype of a hybrid is by:-

  1. Crossing of one F1 progeny with recessive parent
  2. Crossing of one F2 progeny with female parent
  3. Crossing of one F2 progeny with male parent
  4. Studying the sexual behaviour of F1 progenies
AIPMT 2007
9

Both sickle cell anemia and Huntington's chorea are-

  1. Congenital disorders
  2. Bacteria-related diseases
  3. Virus-related diseases
  4. Pollutant-induced disorders
AIPMT 2006
10

Test cross involves-

  1. Crossing between two F1 hybrids
  2. Crossing the F1 hybrid with a double recessive genotype
  3. Crossing between two genotypes with recessive trait
  4. Crossing between two genotypes with dominant trait
AIPMT 2006
11

If a colour blind woman marries a normal visioned man, their sons will be

  1. All normal visioned
  2. Three-fourths colourblind and one-fourth normal
  3. One-half colourblind and one-half normal
  4. All colourblind
AIPMT 2006

All Principles of Inheritance and Variation PYQs →

PDFDownload Principles of Inheritance and Variation PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All NEET Botany chapters
Class 11The Living WorldBiological ClassificationPlant KingdomMorphology of Flowering PlantsAnatomy of Flowering PlantsCell: The Unit of LifeCell Cycle and Cell DivisionTransport in PlantsMineral NutritionPhotosynthesis in Higher PlantsRespiration in PlantsPlant Growth and Development
Class 12Reproduction in OrganismsSexual Reproduction in Flowering PlantsPrinciples of Inheritance and VariationMolecular Basis of InheritanceStrategies for Enhancement in Food ProductionMicrobes in Human WelfareOrganisms and PopulationsEcosystemBiodiversity and ConservationEnvironmental Issues
Other chaptersBiomolecules (Biology)