In pea plants, size of starch grains and seed shape is controlled by ____.

Correct! Wrong!

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In pea plants, size of starch grains and seed shape is controlled by the same gene with two alleles.

Experimental proof for the chromosome theory of inheritance was provided by ____.

Correct! Wrong!

Experimental proof for the chromosome theory of inheritance was provided by Morgan.

Identify the wrong statement

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In domesticated fowls the sex is determined by the ovum.

The resemblance of individuals to their progenitors is called

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Heredity is the transmission of genetic characters from parents to the offspring.

Mendel’s factors are now known as ____.

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Mendel’s factors are now known as genes.

In man, which of the following genotypes and phenotypes may be the correct result of aneuploidy in sex chromosomes

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An addition or loss of chromosomes is more or less than an entire set of chromosomes, is known as aneploidy.

An organism with two identical alleles is

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Homozygous individuals have identical mendelian factors or genes for a character (TT or tt). They are always pure for a particular trait (character).

45+X embryos are born with ____.

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45 +X, embryos are born with Turner’s syndrome. It affects development in females due to missing X chromosome.

Mutation is

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Mutation is generally recessive. Mutation is a process which produces a heritable alteration in the genotype. Mutations are classified into two main types: (a) Chromosomal mutation; (b) Point mutation.

Haemophilia is more common in males because it is a

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Haemophilia is a sex linked recessive trait carried by X chromosome (also known as bleeder's disease).

What type of gametes will form by genotype RrYy?

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RrYy is a dihybrid, so four type of gametes are formed as RY, Ry, rY, ry.

On inbreeding, the homozygous parents plants will produce ____.

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On inbreeding, the homozygous parent plants will produce all similar offspring. Homozygous plants have both the alleles of the same type and hence the offspring produced will of the same type.

The number of autosomes in human female ovum is

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In human female ovum, number of autosome are 22 pairs.

Haemophilia is

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Haemophilia is a X-linked disease. It is also known as Royal's disease. Haemophilia is due to mutation in factor VIII of blood clotting Anti -Haemophilic Globin factor(AHG) which is also known as AHF (Anti Haemophilic Factor).

One of the contrasting forms of character is said to be a/an ____.

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One of the contrasting forms of character is said to be an allele.

Mutation caused by a mutagen is

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Mutation induced by a mutagen are called as induced mutation.

The branch of botany dealing with heredity and variation is called

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Genetics is the study of principles and mechanism of heredity and variations.

Haemophilia is an example of ____ disease.

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Haemophilia is an example of a sex-linked recessive disease. It is associated with the X chromosome.

Which pair is chromosomal aberration?

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Duplication & Translocation is chromosomal abberrations. Duplication & translocation both are mutation.

Linkage map construction is based on ____.

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Linkage map construction is based on crossing over frequency.

A dihybrid condition is

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Dihybrid condition involves simultaneous inheritance of two pairs of mendelian factors or genes.

Which one of the following traits of garden pea studied by Mendel was a recessive feature?

Correct! Wrong!

Yellow seed colour is dominant over green seed colour.

Frameshift mutations are caused by ____.

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Frameshift mutations are caused by deletion or insertion of a nucleotide. As a result of deletion or insertion of nucleotides the entire sequence of triplet codons involved in protein synthesis changes.

Genes located on Y-chromosome are

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Holandric genes are present on the differential region of the Y-chromosome. The differential regions carry completely sex linked genes and they do not undergo crossing over.

ZW method of sex determination is seen in ____.

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ZW method of sex determination is seen in birds.

Mendel proposed which of following term for hereditary units?

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Mendel factor now known as gene (Johannsen, 1905) is a unit of inheritance.

Down’s syndrome is a genetic disorder characterized by ____.

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Down’s syndrome is a genetic disorder characterized by all body cells having an extra chromosome.

Alleles are form of

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Allele is an alternative form of a gene for example, T and t alleles represent tall and short stem height of pea plant.

A gene is said to be dominant if

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A dominant gene would lead to the expression of its phenotype irrespective of the fact whether its allelic gene is dominant or recessive.

In co-dominance, F1 hybrids show ____.

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In co dominance, F1 hybrids show both dominant and recessive characters side by side.

Class 12th Biology - 5 Heredity and Variation MCQs
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Class 12th Biology - 5 Heredity and Variation MCQs