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

Which of the following statements is/are correct about the first generation purebred cross between tall and dwarf plants?

a. Only tall plants were produced in the first generation. b. Tall and dwarf plants were produced in the ratio 3 : 1. c. Only dwarf plants were produced in the F1. d. The seeds were round and green.

  1. a and d

  2. only a

  3. b and d

  4. only b

  5. only c
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct answer as in the first generation, only tall plants were obtained as the dominant gene Tt or TT was present in purebred tall plants.

Multiple choice

________ seeds were seen in the second generation when Mendel crossbred purebred F1 pea plants having round yellow seeds by self-pollination.

a. Round yellow b. Round green c. Wrinkled yellow d. Wrinkled green

  1. a, b, c and d

  2. a and c

  3. b and d

  4. a and b

  5. a and d
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct answer. When Mendel crossbred purebred F1 pea plants having round yellow seeds by self-pollination, in the second generation, four types of seeds were seen. These were round yellow, round green, wrinkled yellow and wrinkled green.

Multiple choice

In peas, tall plant trait is dominant over dwarf. If a heterozygous for tall is crossed with one homozygous for dwarf, what will be the appearance of the offspring of a cross of F1?

  1. All tall

  2. All dwarf

  3. 50% tall and 50% dwarf

  4. 75% tall and 25% dwarf
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 In peas, tall plant trait is dominant over dwarf. If a heterozygous for tall is crossed with one homozygous for dwarf, there will be 50% tall and 50% dwarf appearance of the offspring of a cross of F1.

Multiple choice

A child who inherits an X chromosome from the father will be a

  1. boy

  2. girl

  3. Either (1) or (2)

  4. Cannot be determined
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

We know that a mother, being female (XX), can contribute only X chromosome to the progeny. If a child inherits X chromosome from the father, then its genetic makeup will contain a pair of X chromosomes, i.e. XX state, and the child will develop into a girl.