Assertion based Inheritance

Assertion : When yellow bodied, white eyed Drosophila females were hybridised with brown-bodied, red eyed males; and F1 progeny was intercrossed, F2 ratio deviated from 9 : 3 : 3 : 1.

Reason : When two genes in a dihybrid are on the same chromosome, the proportion of parental gene combinations are much higher than the non-parental type.

• Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

• Both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

• Assertion is true but Reason is false.

• Both Assertion and Reason are false

Assertion : At F2 stage in monohybrid cross, both parental traits are expressed in the proportion of 3 : 1.

Reason : The contrasting parental traits show blending at F2 stage.

• Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

• Both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

• Assertion is true but Reason is false.

• Both Assertion and Reason are false

Assertion : Test cross is the cross between the F1 progeny and either of the parent types.

Reason : Back cross is the cross between F1 progeny and the double recessive genotype.

• Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

• Both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

• Assertion is true but Reason is false.

• Both Assertion and Reason are false

Assertion : The pink coloured flowers appear in F2 generation of plant Mirabilis jalapa.

Reason : This is observed due epistatic suppression of white colour alleles in one of parental flowers by red colour alleles.

• Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

• Both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

• Assertion is true but Reason is false.

• Both Assertion and Reason are false

Assertion : Pairing and separation of pair of chromosomes would lead to segregation of a pair of factors they carried.

Reason : Two alleles of a gene pair are located on similar sites on non-homologous chromosomes.

• Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

• Both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

• Assertion is true but Reason is false.

• Both Assertion and Reason are false

Assertion : The law of independent assortment can be studied by means of dihybrid cross.

Reason : The law of independent assortment is applicable only to unlinked genes.

• Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

• Both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

• Assertion is true but Reason is false.

• Both Assertion and Reason are false

Assertion : Mendel conducted artificial pollination experiments for his genetic studies using true-breeding pea lines.

Reason : A true-breeding line shows the stable trait inheritance and expression for several generations.

• Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

• Both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

• Assertion is true but Reason is false.

• Both Assertion and Reason are false

Assertion : The maximum frequency of recombination, that can result from crossing over between linked genes, is 50 percent.

Reason : Genes shown higher frequency of crossing over if distance between them is longer.

• Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

• Both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

• Assertion is true but Reason is false.

• Both Assertion and Reason are false

Assertion : ABO blood group system provides a good example of multiple alleles.

Reason : In ABO blood group system, when |^A and |^B alleles are present together, they both express their own types.

• Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

• Both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

• Assertion is true but Reason is false.

• Both Assertion and Reason are false

Assertion (A): The linked genes tend to get inherited together.

Reason (R): The linked genes are physically associated with each other and work as single unit.

• Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

• Both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

• Assertion is true but Reason is false.

• Both Assertion and Reason are false