Tag: experiments of mendel

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

It is said that Mendel proposed that the factor controlling any character is discrete and independent. His proposition was based on the

  1. Results of $F _3$ generation of a cross

  2. Observations that the offspring of a cross made between the plants having two contrasting characters shows only one character without any blending
  3. Self pollination of $F _1$ offsprings
  4. Cross pollination of $F _1$ generation with recessive parent
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mendel crossed two parent plants having contrasting characters. He found that in the first filial generation, F1 generation, the dominant of the two expressed while the recessive is suppressed. Apart from this,  When the f1 generation is self crossed, in the F2 generation, these recessive characters appear again. Therefore, it is not that they have disappeared. 

So, option B is the correct answer.

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

Which of these is not a part of Mendel's laws

  1. Law of independent assortment

  2. Law of segregation

  3. Law of dominance

  4. Law of linkage
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Linkage is the tendency of two or more genes to inherit together as a pair and not to sort out independently.
Thus, linkage is not applicable according to Mendelian principles.
Linkgae is strictly against Law of independent assortment where Mendel explains that the characters are sorted out independently while forming gametes.

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

Mendel's law of heredity can be explained with the support of  

  1. Mitosis

  2. Meiosis

  3. Both mitosis and meiosis

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Meiosis is otherwise called as Reductional division where the ploidy level of the organism is halved. Meiosis occurs in sex cells where Law of Independent assortment is well applicable. Because during meiosis, the hereditary units are inherited independently and segregated in chromosomes. One allele of a trait segregates and moves to the chromosomes such that the offspring can acquire characters from any one parent. Thus the law of Segregation also is proved well by the process of Meiosis. The expression of phenotype very well depends on Mendel's law of dominance. The dominant character is expressed in both homozygous and heterozygous forms. Whereas recessive characters are expressed only in homozygous forms.

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

Heterozygous tall plant is selfed. It produces both tall and dwarf plants. This confirmed Mendel's law

  1. Law of dominance

  2. Law of segregation

  3. Law of independent assortment

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

 According to the law of seggregation  alleles of a trait that remain together in an individual do not mix but rather keep their identity intact. They separate during gamete formation and get randomly distributed only to get paired again in the offspring’s as per the principle of probability. This results in a phenotypic trait in the 3:1 ratio in the F2 generation i.e when a heterozygous plant is crosssed. So, the correct answer is 'Law of segregation'.

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

Mendel formulated some laws, they are known as____________

  1. Laws of germplasm

  2. Laws of origin of species

  3. Laws of recapitulation

  4. Laws of inheritance
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • Mendel is known as 'Father of Genetics' because he had described basic laws of inheritance. 
  • He was not aware of the biological mechanism of inheritance but accurately explained what actually happens when two parents having a contrasting pair of character breed, i.e, the 3:1 ratio between dominant and recessive phenotypes and 1:2:1 genotypic ratio is Mendel's contribution for which he is known as 'Father of Genetics'.
Multiple choice botany heredity: from parents to offsprings experiments of mendel mendel's law of inheritance works of mendel

The first fruitful results in the study of the inheritance of biological traits were obtained by

  1. Shull

  2. T. H. Morgan

  3. G. J. Mendel

  4. Punnet and Bateson
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Gregor Johann Mendel was the first to demonstrate the scientific basis of inheritance and variation by conducting hybridisation experiment. He worked on garden pea for 7 years and proposed the law of inheritance in living organisms. 
So, the correct option is 'G. J. Mendel'.
Multiple choice botany heredity: from parents to offsprings experiments of mendel mendel's law of inheritance works of mendel

In a population of $400$ individuals, the frequency of a recessive allele is $40%$. Find out which of these represents the total number of individuals with dominant phenotype?

  1. $144$
  2. $192$
  3. $256$
  4. $336$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • In the population of 400 individuals if 40% is recessive allele and 60% will be dominant (144).

So, the correct option is '144'.

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

The first scientific explanation regarding inheritance was given by

  1. William Bateson

  2. Gregor Johann Mendal

  3. Grillith

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

Gregor Johann Mendel first explained scientifically the explanation regarding inheritance using 7 traits in Pea plants(Pisum sativum) in 1886.

So, the correct option is 'Gregor Johann Mendel'.

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

Which one of the following ratio/s represent variation in phenotypic ratio of monohybrid $F _2$ and incomplete dominance $F _2$ results, with regard to Mendelian inheritance.

  1. $1:2:1$
  2. $3:1$
  3. $9:3:3:1$
  4. Both $2$ and $3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Incomplete dominance F2 phenotypic ratio is 1:2:1, and the genotypic ratio of a monohybrid F2 is also 1:2:1.