Tag: mendel's law of inheritance

Questions Related to mendel's law of inheritance

How many different types of phenotypes would be produced in $F _{1}$ progeny in the following cross that obeys Mendel's law of independent assortment $AABBCC\times aabbcc$.

biology mendel's law of inheritance mendel's laws laws of inheritance mendel's laws of inheritance

  1. $1$

  2. $8$

  3. $27$

  4. $64$

Show answer
Correct Option: A

Discovery Of Mendels law of segregation required the use of:

biology mendel's law of inheritance mendel's laws laws of inheritance mendel's laws of inheritance

  1. dihybrid parental and F1 crosses

  2. plants showing incomplete dominance

  3. test crosses

  4. parental crosses with true-breeding plants followed by crosses with F1 heterozygous plants

Show answer
Correct Option: D
Explanation:

Discovery of mendels law of segregation required the use of parental crosses with true breeding plants followed by crosses with f1 heterozygous plants.

So, the correct option is 'parental crosses with true-breeding plants followed by crosses with F1 heterozygous plants'

Mendel proposed his 'laws' on the basis of his researches on seven contrasting characters in garden pea which has $14$ chromosomes per somatic cell. If, instead of garden pea, Mendel had chosen to work on seven characters in a plant species having only four chromosomes per somatic cell, then the most likely outcome would have been that.

biology mendel's law of inheritance mendel's laws laws of inheritance mendel's laws of inheritance

  1. He would have discovered blending inheritance

  2. He could not have proposed that genes are located on the chromosomes

  3. He might not have discovered the law of independent assortment

  4. He might not have discovered the law of segregation

Show answer
Correct Option: A

If individuals of genotype Aa Bb Cc are intercrossed, how many different phenotypes can appear in their offspring?

biology mendel's law of inheritance mendel's laws laws of inheritance mendel's laws of inheritance

  1. 3

  2. 6

  3. 8

  4. 16

Show answer
Correct Option: B
Explanation:

In the given question the number of the heterozygous gene pair is 3 so the number of phenotypes will also be 3.

So, the correct option is '6'.

Which of the following explains how progeny can possess combinations of traits that neither parent possessed?

biology mendel's law of inheritance mendel's laws laws of inheritance mendel's laws of inheritance

  1. Polygenic inheritance

  2. Law of independent assortment

  3. Law of independent segregation

  4. Chromosome theory

Show answer
Correct Option: B
Explanation:

Mendel's law of independent assortment states that allele pairs separate and segregate independently of one another during the formation of gametes. So, traits are transmitted to offspring independently of one another and recombinants are seen along with the parental types in the genotype of the next generation. So, progeny can have a new combination of traits that are not seen in either parent. So, the correct option is 'Law of independent assortment'.

Which of the following is not considered as a law?

biology mendel's law of inheritance mendel's laws laws of inheritance mendel's laws of inheritance

  1. Law of dominance

  2. Law of independent assortment

  3. Law of segregation

  4. None of the above

Show answer
Correct Option: A
Explanation:

The law of dominance is significant and true but is not universally applicable. Only Law of independent assortment and Law of segregation are considered to be laws. The third one is considered as a basic principle but not a genetic law of Mendel. Therefore, (a) is the correct answer.

Choose the correct answer from the alternatives given.
Mendels law of independent assortment does not hold true for the genes that are located closely on ______________________.

biology mendel's law of inheritance mendel's laws laws of inheritance mendel's laws of inheritance

  1. Same chrormosome

  2. Non-homologous chromosomes

  3. X-chromosome

  4. Autosomes

Show answer
Correct Option: A
Explanation:

As per linkage experiments carried out by Morgan, the two linked genes do not always segregate independently of each other and $F _2$ ratio deviated very significantly from 9:3:3:1 ratio (expected when two genes are independent). Hence, if linkage was known at the time of Mendel, he would riot have been able to explain law of independent assortment. 

Choose the correct answers from the alternatives given.
The mechanisms of .................have been referred to as life's defenses against disorder.

biology mendel's law of inheritance mendel's laws laws of inheritance mendel's laws of inheritance

  1. respiration

  2. homeostasis

  3. adaptation

  4. metabolism

Show answer
Correct Option: B
Explanation:

Homeostasis is any self-regulating process by which an organism trying to maintain stability while adjusting to conditions that are best for its survival. If homeostasis is successful, life continues, if it's unsuccessful, it results in a disaster or death of the organism.

So the correct answer is B, homeostasis.

According to the concept of dominance, the modified allele is equivalent to the unmodified allele when?

biology mendel's law of inheritance mendel's laws laws of inheritance mendel's laws of inheritance

  1. It produces normal/less efficient enzyme

  2. It produces the same phenotype/trait

  3. It results in the transformation of substrate

  4. More than one option is correct

Show answer
Correct Option: A
Explanation:
A gene is responsible for the appearance of a specific trait. In diploid organisms, a gene is represented by a pair of alleles. When these two alleles are not identical, one of alleles is different with modified information. Normal allele will form normal enzyme. Changed or modified allele can form three types of enzymes i.e. normal enzyme, non-functional enzyme, no enzyme at all. Enzyme is always required for the formation of substrate say ‘S’. Modified allele is almost similar to normal allele and forms the same enzyme and produces same phenotypic trait i.e., leads to the formation of substrate ‘S’. But sometimes allele formed are non­functional enzyme or no enzyme and phenotypic trait depends on functioning of un-modified allele. Functioning or unmodified allele will form the original normal phenotypic trait (due to dominant allele) and modified allele will be known as recessive allele.
So the correct option is 'it produces normal/less efficient enzyme'.

The effect of dominant allele is studied under ______________

mendel's law of inheritance mendel's laws laws of inheritance mendel's laws of inheritance

  1. Law of independent assortment

  2. Law of dominance

  3. Law of segregation

  4. None of the above

Show answer
Correct Option: B
Explanation:

Some alleles are dominant while others are recessive. Organism with at least one dominant allele will display the effect of the dominant allele, which is studied under Law of dominance. Therefore, (b) is the correct answer.