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

The intelligence test scores of identical twins are

  1. lower when they are raised together than when they are raised apart

  2. greater than the fraternal twins raised together

  3. lower than any other blood relatives

  4. the same whether they are reared together or apart
Reveal answer Fill a bubble to check yourself
B Correct answer
Multiple choice

Superiority of hybrid over parents is

  1. heterosis

  2. gigantism

  3. dwarfism

  4. lethality
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

It is the increase in such properties as size, growth rate, fertility, and yield of a hybrid organism over those of its parents. Plant and animal breeders use heterosis by mating two different pure-bred lines that have certain desirable traits.

Multiple choice

A woman has a rare abnormility of eyes, called ptosis. A single dominant gene P is responsible for it. The woman's father had ptosis, but her mother was normal. What is the probable genotype of the woman and her father?

  1. Woman = pp Father = Pp

  2. Woman = Pp Father = pp

  3. Woman = Pp Father= Pp

  4. Woman = pp Father = pp
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The woman would have Pp genotype and her father would also have Pp genotype. As P gene is dominant, her father had ptosis and she inherited this gene from her father, so she also got ptosis.

Multiple choice

Mule is a result of

  1. intraspecific hybridisation

  2. interspecific hybridisation

  3. double fertilisation

  4. environmental variation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mule is the result of interspecific hybridisation. It is a hybrid of donkey and horse.

Multiple choice

ABO blood grouping is based on

  1. incomplete dominance and multiple alleles

  2. multiple alleles

  3. co-dominance and multiple allelism

  4. pleiotropic effect
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

ABO blood grouping is based both on co-dominance and multiple allelism.