Tag: mendel's laws of inheritance

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Multiple choice biology mendel's law of inheritance experiments of mendel works of mendel mendel's laws of inheritance

Mendel's work was republished

  1. In 1900

  2. At the beginning of 20 th centuary

  3. In the proceedings of the "Natural History" Society of Brunn

  4. Both A and C
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Answer is A.

In 1900
The apparently simultaneous discovery of Mendel's laws by de Vries, Correns, and Tschermak suggests that by 1900 rediscovery had become inevitable.

Multiple choice biology mendel's law of inheritance experiments of mendel works of mendel mendel's laws of inheritance

The main reason for the success of Mendel was that

  1. He made statistical analysis of the offsprings.

  2. He first took only one character at a time in his crosses.

  3. He kept pedigree records.

  4. He selected pea plants.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Main reasons for the success of Gregor Mendel: 

1. Mendel concentrated in one or few characters at a time.
2. He made controlled crosses and kept careful numerical records of the results.
3. He suggested 'factors' as a cause of characters.
4. The experimental material Pisum sativum was a wise choice.

Multiple choice biology mendel's law of inheritance experiments of mendel works of mendel mendel's laws of inheritance

Correct reason of Mendel's success was

  1. He repeated each experiment several times.

  2. Traits chosen by him had genes far apart so that linkage was absent.

  3. He kept record of all experiments.

  4. He used statistical techniques.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mendel chose seven pairs of contrasting traits, the gene for each of which is present on seven different chromosomes of pea plant. Due to the presence on different chromosomes, Mendel's trait followed independent assortment during meiosis and produced the expected parental and recombinant phenotypes. If genes of these traits would have present together showing linkage, Mendel would not have got the expected results. Repeating the experiment, keeping records and use of statistical analysis were the secondary factors; major being the chosen traits not showing linkage. 

So, the correct answer is 'Traits chosen by him had genes far apart so that linkage was absent'.

Multiple choice biology mendel's law of inheritance experiments of mendel works of mendel mendel's laws of inheritance

Mendel was lucky, because

  1. He was born in Austria which is a nice country.

  2. He used pea plant for his experiment which is rich in protein.

  3. The genes for different characters are located on different chromosomes in Pisum sativum.

  4. The Pisum sativum is short-lived plant.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mendel was lucky because he used pea plant i.e. Pisum sativum, they are bisexual, they had pure breeding varieties with observable characters, & each character is regulated by one type of gene, whether it is tall, dwarf, round or wrinkled etc. It was an ideal choice for him.

So, the correct answer is "The genes for different characters are located on different chromosomes in Pisum sativum".

Multiple choice biology mendel's law of inheritance experiments of mendel works of mendel mendel's laws of inheritance

Mendel was successful in formulating the laws of inheritance whereas his predecessors were not because

  1. He studied one clear-cut character at a time

  2. The characters studied by him were present on separate chromosomes

  3. Of the right choice of material

  4. He kept accurate records of his experiments
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mendel was successful in formulating the laws of inheritance whereas his predecessors were not because of the following reasons.

He selected only pure breeding varieties of pea for his experiments.

He took one or two characters at one time while his predecessor often studied all the traits simultaneously.

He formulated theoretical explanations for interpreting his results.

He used statistical methods and law of probability for analyzing results, etc.,

So, the correct explanation is ‘He studied one clear-cut character at a time’.

Multiple choice biology mendel's law of inheritance experiments of mendel works of mendel mendel's laws of inheritance

Mendel's laws were rediscovered by

  1. Lamarck, de Vries and Correns

  2. Hugo de Vries, Correns and Tschermak

  3. Morgan, Beadle and Tatum

  4. Hugo de Vries, Morgan and Correns
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mendel’s work(monohybrid cross & dihybrid cross) did not receive any recognition, remained unnoticed, and unappreciated for several years due to the following reasons:

Communication was not easy in those days and his work could not be widely publicized.

His concept of stable, unblending and discrete units or factors for various traits did not find acceptance from the contemporaries.

His approach of using mathematics and statistical analysis to explain biological phenomena was totally new and unacceptable to many biologists. He could not provide any physical proof for the existence of factors. In 1900, three scientists Hugo de Vries, Carl Correns, and Erich von Tschermark, worked independently on Mendel’s work, proved whatever explained by Mendel on inheritance is true. It is called Rediscovery of Mendel’s laws.

So, the correct answer is 'Hugo de Vries, Correns and Tschermak'.

Multiple choice biology mendel's law of inheritance experiments of mendel works of mendel mendel's laws of inheritance

Correct reason for Mendel's success was

  1. He repeated each experiment several times

  2. Traits chosen by him had genes far apart so that linkage was absent

  3. He kept record of all experiments

  4. He used statistical techniques
Reveal answer Fill a bubble to check yourself
B Correct answer
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 ‘Traits chosed by him had genes far apart so that linkage was absent’.

Multiple choice biology mendel's law of inheritance experiments of mendel works of mendel mendel's laws of inheritance

When two genes control a single character and have cumulative effect the ratio is _______

  1. $1:1:1:1$
  2. $1:4:6:4:1$
  3. $1:2:1$
  4. $1:6:15:20:15:6:1$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
When two genes present on the same loci give an additive or cumulative effect like the spotted and Dotted seed of Lens sps the ratio is 1:2:1
So, the correct answer is '1:2:1'