Tag: botany

Questions Related to botany

If a plant is heterozygous for tallness, the ${F _2}$ generation has both tall and dwarf plants. This proves the principle of

botany heredity: from parents to offsprings experiments of mendel mendel's law of inheritance works of mendel

  1. Dominance

  2. Segregation

  3. Independent assortment

  4. Incomplete dominance

Show answer
Correct Option: B
Explanation:
  • According to the law of dominance, a trait is represented by two contrasting factors of a gene in a heterozygous individual; only dominant trait is expressed, irrespective of the presence of both factors, in a heterozygous individual.
  •  It does not tell about the reappearance of the missing trait in $F _2$ generation. The law of segregation states that the two factors for a trait, present together in a heterozygous individual, do not get mixed and are separated during gametogenesis. 
  • Thus each gamete receives one allele for a trait and two types of gametes are formed; 50% gametes carry factor for dominance and 50% carry the recessive factor. Random fusion of these gametes leads to the presence of both recessive and dominant individuals in $F _2$ generation. 
  • Law of independent assortment tells about segregation and distribution of factors governing two different traits; not about segregation of factors of one trait. Incomplete dominance is the condition when none of the factors of a gene is dominant and the phenotype of a heterozygous dominant individual is a blend of dominant and recessive traits. 
  • It affects the phenotype of $F _1$ individuals, not that of $F _2$. Thus, the correct answer is option B.

Mendel enunciated principles of inheritance

botany heredity: from parents to offsprings experiments of mendel mendel's law of inheritance works of mendel

  1. Two

  2. Three

  3. Four

  4. Five

Show answer
Correct Option: B
Explanation:

Gregor Johann Mendel, an Austrian Monk, discovered the principles of heredity through the experiments on the pea plant. Mendel conducted hybridization experiments on garden peas for seven years and proposed the laws of inheritance in living organisms. They are the Law of dominance, Law of segregation, Law of Independent assortment.

So, the correct option is ‘Three’.

Principles or laws of inheritance were enunciated by

botany heredity: from parents to offsprings experiments of mendel mendel's law of inheritance works of mendel

  1. Mendel

  2. Morgan

  3. Bateson

  4. Punnet

Show answer
Correct Option: A
Explanation:

Gregor Johann Mendel, an Austrian Monk. He discovered the principles of heredity through the experiments on the pea plant. Mendel conducted hybridization experiments on garden peas for seven years and proposed the laws of inheritance in living organisms. They are Law of dominance, Law of segregation, Law of Independent assortment. He is regarded as Father of Genetics.

So, the correct option is ‘Mendel’,

Mendel was successful In discovering the principles of inheritance as __________________.

botany heredity: from parents to offsprings experiments of mendel mendel's law of inheritance works of mendel

  1. He took Pea plants for his experiments

  2. He was a mathematician

  3. He did not encounter linkage

  4. He had an indepth knowledge on hybridisation.

Show answer
Correct Option: C
Explanation:

He chose garden pea that was easy to grow and to hybridise artificailly.

The plant reproduce well and grows to maturity in a single season.

Mendel then chose to follow seven visible features(unit characters), each represented by two contrasting forms or traits.

Mendel was fortunate in choosing a diploid plant because diploid organisms contain only two sets of chromosomes.

A singe alteration in a trait was therefore demonstrated by a visible differences between varieites.

He restricted his examination to one or very few pairs of contrasting traits in each experiment.

He also kept accurate quatitative records, a necessity in genetic experiments.

In his experiments, no appearance of recombinations and linkage.

So, the correct option is ‘He did not encounter the linkage’.

The characters selected by Mendel were located on ______________.

botany heredity: from parents to offsprings experiments of mendel mendel's law of inheritance works of mendel

  1. 4 different chromosome

  2. 7 different chromosome

  3. 6 different chromosome

  4. 5 different chromosome

  5. 3 different chromosome

Show answer
Correct Option: A

What is the blending theory of inheritance?

botany heredity: from parents to offsprings experiments of mendel mendel's law of inheritance works of mendel

  1. Mendels theory of how the traits of parents are passed to offspring through the gametes

  2. Darwins theory of how traits are passed from all parts of the parents body into the gamete to be transmitted to the offspring

  3. The modern theory of how genetic information is passed from parents to offspring

  4. An old theory that said that offspring show traits intermediate between those of the parents

Show answer
Correct Option: D
Explanation:

The blending theory state that the inheritance of traits from two parents produces offspring with characteristics that are intermediate between those of the parents.

So, the correct option is 'An old theory that said that offspring show traits intermediate between those of the parents'.

Which of the following characteristics represent inheritance of dihybrid crosses in pea :
a) Incomplete dominance
b) Dominance
c) Law of segregation 
d) Co - dominance
e) Polygenic inheritance
f) Law of independent assortment 

botany unravelling genetic mysteries experiments of mendel mendel's law of inheritance works of mendel

  1. b and f

  2. a, d and f

  3. b, c and f

  4. b , c and e

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Correct Option: A

Successive exploitation of heterocyst depends upon the ______________.

botany unravelling genetic mysteries experiments of mendel mendel's law of inheritance works of mendel

  1. Presence of heterotic effect in the hybrid

  2. Availability of male sterility

  3. Out crossing nature of the flower

  4. Heterotic effect and availability

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Correct Option: A

Triticale has been developed through cross between

botany unravelling genetic mysteries experiments of mendel mendel's law of inheritance works of mendel

  1. Maize and Rye

  2. Maize and grass

  3. Rice and Rye

  4. Wheat and Rye.

Show answer
Correct Option: D

If mendel had studied the 7 traits using a plant with 12 chromosomes instead of 14 ,in what way this interpretation have been different 

botany unravelling genetic mysteries experiments of mendel mendel's law of inheritance works of mendel

  1. He would have mapped the chromosomes

  2. He would have discovered blending or incomplete dominance

  3. He would not have discovered law of independent assortement

  4. He would have discovered sex linkage

Show answer
Correct Option: A