Biology

Genetics and Plant Breeding

1,240 Questions

Genetics and Plant Breeding explores the principles of heredity, chromosomal inheritance, and hybridization techniques. It includes key concepts like Mendelian genetics, gene linkage, and polygenic inheritance. This topic is essential for students tackling advanced biology or botany sections in competitive examinations.

Mendelian InheritanceChromosome TheoryGene LinkagePolygenic InheritancePlant HybridizationPopulation Genetics Equilibrium

Genetics and Plant Breeding Questions

Multiple choice

What does the term 'locus' refer to in genetics?

  1. The physical expression of a character

  2. The genetic expression of a character

  3. The position of an allele on a chromosome.

  4. The basic unit of character inheritance
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

It is the position of an allelic form of gene on the homologous chromosomes.

Multiple choice

Which of the following statement(s) is/are incorrect?I. Out-crossing allows the desirable qualities of two different breeds to be combined.II. Hisardale is a new breed of sheep developed in Punjab by crossing Bikaneri ewes and Marino rams.III. Cross-breeding is the best breeding method for animals that are below average in productivity in milk production, growth rate in beef cattle, etc.

  1. Only I

  2. Only II

  3. Only III

  4. Both I and II

  5. Both I and III
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Correct statements:I. Cross-breeding allows the desirable qualities of two different breeds to be combined.II. Hisardale is a new breed of sheep developed in Punjab by crossing Bikaneri ewes and Marino rams.III. Out-crossing is the best breeding method for animals that are below average in productivity in milk production, growth rate in beef cattle, etc.

Multiple choice

The main steps in breeding a new genetic variety of a crop are:

  1. Collection of variability
  2. Cross hybridization among the selected parents
  3. Testing, release and commercialization of new cultivars
  4. Evaluation and selection of parents
  5. Selection and testing of superior recombinants

What is the correct sequence of these steps?

  1. 1, 2, 3, 4, 5

  2. 1, 4, 2, 5, 3

  3. 1, 4, 5, 2, 3

  4. 1, 5, 4, 3, 2
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This option is correct as this is the correct sequence.

Multiple choice

Consider the following statements:I. Crosses between different breeds are called out-breeding.II. The practice of mating of animals within the same breed, but having no common ancestors on either side of their pedigree up to 4-6 generations, is known as Cross-breeding.III. The method in which superior males of one breed are mated with superior females of another breed is known as Out-crossing.Which of the above statement(s) is/are correct?

  1. Only I

  2. Only II

  3. Only III

  4. Both I and II

  5. Both I and III
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct answer choice as statements II and III are incorrect.The correct statements are :II. The practice of mating of animals within the same breed, but having no common ancestors on either side of their pedigree up to 4-6 generations, is known as Out-crossing.III. The method in which superior males of one breed are mated with superior females of another breed is known as Cross-breeding.