Biology

Genetics and Plant Breeding

1,177 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

Law of Mendel which is not completely applicable is

  1. co dominance

  2. law of segregation

  3. law of independent assortment

  4. law of dominance
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In some situations, both alleles are expressed equally. A genetic scenario where neither allele is dominant nor recessive and both get expressed is known as codominance. This is not Mendel`s law.

Multiple choice

If a cross is made between AA and aa, the nature of F1 progeny will be

  1. genotypically AA and phenotypically a

  2. genotypically Aa and phenotypically a

  3. genotypically Aa and phenotypically A

  4. genotypically aa and phenotypically A

  5. -
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In F1 generation, according to law of dominance the genotypes would be of Aa type. Phenotypically, they all will be of dominant type (A).

Multiple choice

Genetic recombination is due to

  1. fertilisation and meiosis

  2. mitosis and meiosis

  3. fertilisation and mitosis

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Genetic recombination during meiosis and fertilisation can lead to a novel set of genetic information, that can be passed on from the parents to the offspring.

Multiple choice

Which of the following laws was not discovered by Mendel?

  1. Law of dominance

  2. Law of segregation

  3. Law of independent assortment

  4. Law of sex determination

  5. -
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is not a law. A sex-determination system is a biological system that determines the development of sexual characteristics in an organism. Most organisms that create their offspring using sexual reproduction have two sexes. Occasionally, there are hermaphrodites in place of one or both sexes.

Multiple choice

Siamese twins mean

  1. that twins are formed from the single zygote and are not separated

  2. that twins are produced from two zygotes

  3. that twins are produced from three zygotes

  4. that twins are borne in Siamese countries
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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Multiple choice

Which of the following terms were coined by Wilhelm Johansen?

  1. Gene, Allele, Genetics

  2. Gene, Genotype, Phenotype

  3. Factor, Genotyepe, Phenotype

  4. Allele, Genotype, Genetics

  5. Â Phenotype, factor, Allele
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Danish botanist Wilhelm Johannsen coined the word gene in 1909 to describe these fundamental physical and functional units of heredity. Wilhelm Johannsen coined the terms genotype and phenotype in 1911.