Question No:1
Assertion: Gregor Mendel, conducted hybridisation experiment on garden peas and proposed the laws of inheritance in living organism.
Reason: Mendel selected 7 true-breeding pea plant varieties.
[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false
Question No:2
Assertion: In a monohybrid cross F1 generation indicate recessive characters.
Reason: Dominance occurs only in homozygous state.
[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false
Question No:3
Assertion: Gene which code for a pair of contrasting traits are known alleles.
Reason: Alleles are slightly different forms of the same gene.
[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false
Question No:4
Assertion: The law of dominance is used to explain the expression of only one of the parental character is a monohybrid cross in the F1– generation.
Reason: The law of dominance explain the propportion of 3 : 1 obtained at the F2 – generation.
[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false
Question No:5
Assertion: Deletions & insertions of base pairs of DNA, causes frame – shift mutation.
Reason: A classical example of frame -shift mutation is sickle cell anaemia.
[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false
Question No:6
Assertion: Increase in a whole set of chromosome in an organism is known as polyploidy
Reason: Failure of cytokinesis after telophase stage of cell division results in polyploidy
[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false
Question No:7
Assertion: Test cross is a back cross.
Reason: In test cross, F1 — individual is crossed with recessive parents.
[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false
Question No:8
Assertion: Inheritance of holandric gene are always from father to son.
Reason: Holandric genes are found on Y- chromosome
[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false
Question No:9
Assertion: In humans, the gamete contributed by the male determines whether the child produced will be male or female
Reason: Sex in human is a polygenic trait depending upon a cumulative effect of some gene on X-chromosome and some on Y-chromosome.
[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false
Question No:10
Assertion: In birds, the chromosomes composition of the sperm determines the sex.
Reason: Male birds are heterogametic.
[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false
Question No:11
In Antirrhinum two plants with pink flowers were hybridized. The F1 plants produced red, pink and white flowers in the proportion of 1 red, 2 pink and 1 white. What could be the genotype of the two plants used for hybridization Red flower colour is determined by RR, and white by rr genes.
[A] rrrr
[B] RR
[C] Rr
[D] rr
Question No:12
A cross in which an organism showing a dominant phenotype is crossed with the recessive parent in order to know its genotype is called
[A] Monohybrid cross
[B] Back cross
[C] Test cross
[D] Dihybrid cross
Question No:13
ABO blood grouping is controlled by gene I which has three alleles and show co-dominance. There are six genotypes. How many phenotypes in all are possible?
[A] Six
[B] Three
[C] Four
[D] Five
Question No:14
The fruit fly Drosophila melanogaster was found to be very suitable for experimental verification of chromosomal theory of inheritance by Morgan and his colleagues because:
[A] It reproduces parthenogenetically
[B] A single mating produces two young flic
[C] Smaller female is easily recognisable from larger male
[D] It completes life cycle in about two weeks
Question No:15
The fruit fly, drosophila melanogaster was found to be very suitable for experimental verification of chromosomal theory of inheritance by Morgan and his colleagues because:
[A] It reproduces parthenogenetically
[B] A single mating produces two young flies
[C] Smaller female is easily recognisable from larger male
[D] It completes life cycle in about two weeks
Principles of Inheritance and Variation Mock Test-12
CategoriesNEET Biology