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

In a dihybrid cross, the expected phenotypic ratio is typically:

  1. 9:3:3:1

  2. 3:1

  3. 1:2:1

  4. 1:1:1:1
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In a dihybrid cross, where two genes with two alleles each are being considered, the expected phenotypic ratio is 9:3:3:1.

Multiple choice

In a testcross, one parent is:

  1. Homozygous Dominant

  2. Heterozygous Dominant

  3. Homozygous Recessive

  4. Heterozygous Recessive
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In a testcross, one parent is homozygous recessive, while the other parent is heterozygous dominant or unknown.

Multiple choice

The law of independent assortment states that:

  1. Alleles of different genes assort independently of each other during gamete formation.

  2. Alleles of the same gene assort independently of each other during gamete formation.

  3. Alleles of different genes assort independently of each other during fertilization.

  4. Alleles of the same gene assort independently of each other during fertilization.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The law of independent assortment states that alleles of different genes assort independently of each other during gamete formation, meaning that the inheritance of one gene does not influence the inheritance of another gene.

Multiple choice

Which of the following is an example of a polygenic trait?

  1. Eye Color

  2. Height

  3. Skin Color

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Eye Color, Height, and Skin Color are all examples of polygenic traits, which are influenced by the interaction of multiple genes.

Multiple choice

The law of dominance states that:

  1. The dominant allele is always expressed in the phenotype.

  2. The recessive allele is always expressed in the phenotype.

  3. Both alleles are expressed in the phenotype.

  4. Neither allele is expressed in the phenotype.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The law of dominance states that the dominant allele is always expressed in the phenotype, while the recessive allele is only expressed in the phenotype when homozygous.

Multiple choice

What is the rule of primogeniture?

  1. The rule that the eldest son inherits all of his father's property.

  2. The rule that the youngest son inherits all of his father's property.

  3. The rule that all of the sons inherit their father's property equally.

  4. The rule that all of the children inherit their father's property equally.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The rule of primogeniture is the rule that the eldest son inherits all of his father's property. This rule was once common in many parts of the world, but it has been abolished in most countries, including India.

Multiple choice

What are the different types of genetic tests?

  1. Single-gene tests.

  2. Multi-gene tests.

  3. Genome-wide sequencing.

  4. All of the above.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

There are three main types of genetic tests: single-gene tests, multi-gene tests, and genome-wide sequencing. Single-gene tests look for mutations in a single gene that is known to be associated with a particular disease. Multi-gene tests look for mutations in multiple genes that are associated with a particular disease or group of diseases. Genome-wide sequencing looks at all of the genes in a person's genome.

Multiple choice

In Mendelian genetics, the expression of a dominant allele masks the expression of its recessive counterpart. What is this phenomenon called?

  1. Dominance

  2. Recession

  3. Co-dominance

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

Dominance is the phenomenon where one allele in a gene pair masks the expression of the other allele.

Multiple choice

What is the term for the different forms of a gene that can exist at a particular locus?

  1. Alleles

  2. Genotypes

  3. Phenotypes

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

Alleles are different versions of a gene that can occur at a specific locus on a chromosome.

Multiple choice

What is the term for the genetic makeup of an individual?

  1. Alleles

  2. Genotypes

  3. Phenotypes

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

Genotype refers to the genetic makeup of an individual, consisting of the alleles they possess at various gene loci.

Multiple choice

What is the process by which genetic material is passed from parents to offspring?

  1. Mitosis

  2. Meiosis

  3. Replication

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

Meiosis is the process by which genetic material is shuffled and distributed to offspring during sexual reproduction.

Multiple choice

What is the term used to describe the phenomenon where epigenetic modifications can be inherited from both parents?

  1. Biparental Inheritance

  2. Uniparental Inheritance

  3. Epigenetic Mosaicism

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

Biparental inheritance refers to the phenomenon where epigenetic modifications can be inherited from both parents, contributing to the genetic diversity of offspring.

Multiple choice

What is the process of crossing a plant with itself to produce offspring that are genetically identical to the parent plant called?

  1. Self-pollination

  2. Hybridization

  3. Mutation

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

Self-pollination is the process of crossing a plant with itself to produce offspring that are genetically identical to the parent plant.

Multiple choice

What is the process of crossing a plant with a plant of a different species to produce offspring that are genetically different from both parents called?

  1. Interspecific hybridization

  2. Hybridization

  3. Mutation

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

Interspecific hybridization is the process of crossing a plant with a plant of a different species to produce offspring that are genetically different from both parents.

Multiple choice

What is the process of crossing a plant with a plant of the same species but a different variety to produce offspring that are genetically different from both parents called?

  1. Intraspecific hybridization

  2. Hybridization

  3. Mutation

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

Intraspecific hybridization is the process of crossing a plant with a plant of the same species but a different variety to produce offspring that are genetically different from both parents.