Class 12 | Biology | chapter 5 | Principles of Inheritance & Variation

In down’s syndrome of a male child, the sex complement is (a) XO (b) 45 XY (c) 45 XX (d) XXY

Ruhul Amin Alig

Class 12 | Biology | chapter 5 | Principles of Inheritance & Variation

A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F1 plants were selfed the resulting genotypes were in the ratio of 1. 3 : 1 : : Dwarf : Tall 2. 1 : 2 : 1 : : Tall homozygous : Tall heterozygous : Dwarf 3. 1 : 2 : 1 : : Tall heterozygous : Tall homozygous : Dwarf 4. 3 : 1 : : Tall : Dwarf

Ruhul Amin Alig

Class 12 | Biology | chapter 5 | Principles of Inheritance & Variation

Our ancestors knew about the inheritance of characters and variations because- (1) They selectively breed plants and animals and selected for organisms that possessed desirable characters. (2) They introduced mutations (3) They performed natural hybridisation (4) All of the above

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Meiosis

Which of the following statement is not correct of two genes that show 50% recombination frequency? (a) The genes are tightly linked. (b) The genes show independent assortment. (c) If the genes are present on the same chromosome, they undergo more than one crossovers in every meiosis. (d) The genes may be on different chromosomes

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Meiosis

Punnett square is used to know the (a) outcome of a cross (b) probable result of a cross (c) types of gametes (d) result of meiosis

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PYQsNEET

At a particular locus, frequency of A allele is 0.6 and that of a is 0.4. What would be the frequency of heterozygotes in a random mating population at equilibrium?

Ruhul Amin Alig

PYQsNEET

A gene locus has two alleles A, a. If the frequency of dominant allele A is 0.4, then what will be the frequency of homozygous dominant, heterozygous and homozygous recessive individuals in the population?

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Class 12 | Biology | chapter 6 | Molecular Basis of Inheritance

How many different kinds of gametes will be produced by a plant having the genotype AABbCC ? (a) Four(b) Nine (c) Two(d) Three

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Class 12 | Biology | chapter 6 | Molecular Basis of Inheritance

Enzymes which have deoxy-ribonucleic acid synthesis capability are I. RNA polymerase I II. Reverse transcriptase III. DNA polymerase (1) II and III only (2) I and II only (3) III only (4) I and III only

Ruhul Amin Alig