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Botany MCQs for NEET — Practice Questions with Answers

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Types of gametes produced by a homozygous parent

many

single type

depends upon number of genes

depends upon number of chromosomes

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Explanation

NCERT Page No. 73

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Disorder caused by the trisomy of chromosome number 21

Klinefelter’s syndrome

Turner’s syndrome

Down’s syndrome

Phenylketonuria

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Explanation

Down's syndrome is caused by the presence of an extra copy of chromosome 21, resulting in trisomy 21. This genetic disorder is characterized by distinctive facial features, intellectual disability, and an increased risk of certain medical conditions.

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Down’s syndrome was first described in the year

1962

1866

1856

1863

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Explanation

NCERT Page No. 91

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In humans karyotype of 47, XXY leads to

Klinefelter’s syndrome

Turner’s syndrome

Down’s syndrome

Edward’s syndrome

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Explanation

NCERT Page No. 91

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Furrowed tongue and partially open mouth are characteristics of

Edward’s syndrome

Turner’s syndrome

Down’s syndrome

Klinefelter’s syndrome.

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Explanation

NCERT Page No. 91

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The chromosome movement during meiosis have been worked out

1900

1902

1911

1930

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Explanation

NCERT Page No. 81

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What was the most significant conclusion that Gregor Mendel drew from his experiments with pea plants?

A. There is considerable genetic variation in garden peas. B. Traits are inherited in discrete units, and are not the results of Êºblending.Êº C. Genes are composed of DNA. D. An organism that is homozygous for many recessive traits is at a disadvantage.

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Explanation

One of Mendel's key conclusions from his experiments with pea plants was the concept of inheritance in discrete units or genes, rather than a 'blending' of traits. He observed that traits are passed down from parents to offspring as distinct, indivisible units.

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An organism with two copies of the same allele is:

A. Homozygous for that trait B. Homologous for the allele C. Heterozygous for that trait D. Heterologous for the allele

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Explanation

An organism with two copies of the same allele for a particular gene is said to be homozygous for that trait. Homozygous individuals have identical alleles, either dominant or recessive, for the gene in question.

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Which of the following about the law of segregation is true?

A. It states that each of two alleles for a given trait segregate into same gametes. B. It can be explained by the segregation of heterologous chromosomes during meiosis. C. It can account for the 3:1 ratio seen in the F2 generation of MendelÊ¹s crosses. D. It is a method that can be used to determine the number of chromosomes in a plant.

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How many unique gametes could be produced through independent assortment by an individual with the genotype AaBbCCDdEE?

A. 4 B. 8 C. 16 D. 32

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