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

What is the probability of an offspring inheriting both dominant alleles from their parents in a cross between two heterozygous individuals?

  1. 0%

  2. 25%

  3. 50%

  4. 75%
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The probability of an offspring inheriting both dominant alleles from their parents in a cross between two heterozygous individuals is 25%. This is because each parent has a 50% chance of passing on the dominant allele, and the offspring must inherit one dominant allele from each parent in order to express the dominant phenotype.

Multiple choice

In a dihybrid cross, the F1 generation shows a phenotypic ratio of 9:3:3:1. What is the genotype ratio of the F2 generation?

  1. 9:3:3:1

  2. 1:2:1:2

  3. 3:1:1:3

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

The F2 generation in a dihybrid cross will have a phenotypic ratio of 9:3:3:1, and a genotype ratio of 9:3:3:1.

Multiple choice

In a dihybrid cross, the F1 generation shows a phenotypic ratio of 12:3:1. What is the genotype ratio of the F2 generation?

  1. 9:3:3:1

  2. 1:2:1:2

  3. 3:1:1:3

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

The F2 generation in a dihybrid cross will have a phenotypic ratio of 9:3:3:1, and a genotype ratio of 9:3:3:1.

Multiple choice

In a dihybrid cross, the F1 generation shows a phenotypic ratio of 15:1. What is the genotype ratio of the F2 generation?

  1. 9:3:3:1

  2. 1:2:1:2

  3. 3:1:1:3

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

The F2 generation in a dihybrid cross will have a phenotypic ratio of 9:3:3:1, and a genotype ratio of 3:1:1:3.

Multiple choice

In a dihybrid cross, the F1 generation shows a phenotypic ratio of 13:3. What is the genotype ratio of the F2 generation?

  1. 9:3:3:1

  2. 1:2:1:2

  3. 3:1:1:3

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

The F2 generation in a dihybrid cross will have a phenotypic ratio of 9:3:3:1, and a genotype ratio of 9:3:3:1.

Multiple choice

In a dihybrid cross, the F1 generation shows a phenotypic ratio of 7:2:1. What is the genotype ratio of the F2 generation?

  1. 9:3:3:1

  2. 1:2:1:2

  3. 3:1:1:3

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

The F2 generation in a dihybrid cross will have a phenotypic ratio of 9:3:3:1, and a genotype ratio of 9:3:3:1.

Multiple choice

In a dihybrid cross, the F1 generation shows a phenotypic ratio of 1:1:1:1. What is the genotype ratio of the F2 generation?

  1. 9:3:3:1

  2. 1:2:1:2

  3. 3:1:1:3

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

The F2 generation in a dihybrid cross will have a phenotypic ratio of 1:1:1:1, and a genotype ratio of 1:1:1:1.

Multiple choice

In a dihybrid cross, the F1 generation shows a phenotypic ratio of 3:1. What is the genotype ratio of the F2 generation?

  1. 9:3:3:1

  2. 1:2:1:2

  3. 3:1:1:3

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

The F2 generation in a dihybrid cross will have a phenotypic ratio of 9:3:3:1, and a genotype ratio of 3:1:1:3.

Multiple choice

In a dihybrid cross, the F1 generation shows a phenotypic ratio of 1:2:1. What is the genotype ratio of the F2 generation?

  1. 9:3:3:1

  2. 1:2:1:2

  3. 3:1:1:3

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

The F2 generation in a dihybrid cross will have a phenotypic ratio of 9:3:3:1, and a genotype ratio of 1:2:1:2.

Multiple choice

In a dihybrid cross, the F1 generation shows a phenotypic ratio of 9:3:4. What is the genotype ratio of the F2 generation?

  1. 9:3:3:1

  2. 1:2:1:2

  3. 3:1:1:3

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

The F2 generation in a dihybrid cross will have a phenotypic ratio of 9:3:3:1, and a genotype ratio of 9:3:3:1.

Multiple choice

In a dihybrid cross, the F1 generation shows a phenotypic ratio of 1:1:2:2. What is the genotype ratio of the F2 generation?

  1. 9:3:3:1

  2. 1:2:1:2

  3. 3:1:1:3

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

The F2 generation in a dihybrid cross will have a phenotypic ratio of 9:3:3:1, and a genotype ratio of 1:2:1:2.

Multiple choice

In a dihybrid cross, the F1 generation shows a phenotypic ratio of 1:2:2:4. What is the genotype ratio of the F2 generation?

  1. 9:3:3:1

  2. 1:2:1:2

  3. 3:1:1:3

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

The F2 generation in a dihybrid cross will have a phenotypic ratio of 9:3:3:1, and a genotype ratio of 1:2:1:2.

Multiple choice

In a dihybrid cross, the F1 generation shows a phenotypic ratio of 1:1:1:2. What is the genotype ratio of the F2 generation?

  1. 9:3:3:1

  2. 1:2:1:2

  3. 3:1:1:3

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

The F2 generation in a dihybrid cross will have a phenotypic ratio of 9:3:3:1, and a genotype ratio of 1:1:1:1.

Multiple choice

In a dihybrid cross, the F1 generation shows a phenotypic ratio of 1:1:2:4. What is the genotype ratio of the F2 generation?

  1. 9:3:3:1

  2. 1:2:1:2

  3. 3:1:1:3

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

The F2 generation in a dihybrid cross will have a phenotypic ratio of 9:3:3:1, and a genotype ratio of 1:1:2:4.

Multiple choice

In a dihybrid cross, the F1 generation shows a phenotypic ratio of 1:2:3:4. What is the genotype ratio of the F2 generation?

  1. 9:3:3:1

  2. 1:2:1:2

  3. 3:1:1:3

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

The F2 generation in a dihybrid cross will have a phenotypic ratio of 9:3:3:1, and a genotype ratio of 1:2:3:4.