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CHOOSE NUMBER OF THE CORRECT ANSWER

1. The first scientific study leading to formulation of laws of heredity was carried out by:

a) Darwin b) Mendel c) Lamark d) Bateson

1. Genetics deals with:

a) Relation between living beings, and environment b) Cell ultra structure and functions c) Inheritance d) Inheritance and variations.

1. An individual having two identical factors of a character is called:

a) Homozygote b) Heterozygote c) Hybrid d) None of the above

1. Blue eye colour is recessive to brown eye colour in human beings. The children of a marriage between blue eyed woman and brown eyed man (whose mother was blue eyed) would be:

a) All brown eyed b) All blue eyed c) Tree brown eyed and one blue eyed d) 50% brown eyed and 50% blue eyed.

1. Epistasis means:

a) One pair of genes can completely mark the effect of another pair of genes b) One pair of genes increases the effect of another pair of genes c) Many genes control a phenotype d) A pair of genes independently controls a phenotype.

1. A gene which shows its effect on more than one character is called:

a) Polymorphic b) Pleiotropic c) Polygene d) Multiple gene

1. Polygenic inheritance is:

a) Inheritance of several genes in a linkage b) Cumulative effect of all the genes c) Qualitative effect of a few major genes d) Quantitative effect of genes

1. Alleles of a gene occur on:

a) Different chromosomes b) Same chromosomes c) Nonhomologous chromosomes d) Homologous chromosomes

1. Offspring of cross between two organisms differing in at least one set of characters is called:

a) Mutant b) Monoploid c) Diploid d) Hybrid d) Variant

1. ABO blood grouping is based on:

a) Codominance b) Incomplete dominance c) Epistasis d) Multiple allelism

1. Which was not propounded by Mendel:

a) Dominance b) Incomplete dominance c) Independent assortment d) Segregation

1. Pleiotropic gene is characterized by:

a) Multiple phenotype b) Multiple genotype c) Single genotype d) Single phenotype

1. An individual with two different alleles is:

a) Mosaic b) Dominant c) Homozygous d) Heterozygous

1. Mendel’s second law of is the law of:

a) Independent assortment b) Segregation c) Domination d) Polygenic inheritance

1. The phenomenon of hiding the effect of the gene pair by another is:

a) Dominance b) Epistasis c) Heterosis d) Mutation

1. Dihybrid cross is connected with principle of:

a) Purity of gametes b) Dominance c) Segregation d) Independent assortment

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1. Reasons for Mendel’s success in unraveling the mechanism of …….. were that he studied one trait at a time and kept the numerical record of the results.
2. The term ……… was introduced to denote the appearance of the trait in an individual.
3. The inheritance in which heterozygous individuals clearly show effects of both alleles is termed as ………. dominance.
4. Under normal circumstances the maximum number of alleles for each gene, that an individual can possess, is only ………
5. Alleles that may exist in more than two different forms are called ………. alleles.
6. A well known example of multiple alleles in human beings is that of the ……… group.
7. A person who has neither antigen A nor antigen B in the blood cells has blood group ……..
8. A person having both antigens A and B falls in blood group ……….
9. Mendel called those traits as …………. which appeared in F₁
10. Mendel called those traits as …………. which disappeared in F₁ but reappeared in F_2:

A a D d B b   1 2 3 4

27. Name the homologous chromosomes 28. Name the alleles genes. 29. Enumerate the types of gametes which are usually formed during meiosis in this cause.

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