Genetics and Evolution (NEET (National Eligibility cum Medical Entrance Test) Biology): Questions 18 - 22 of 186

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Question number: 18

» Genetics and Evolution » Heredity and Variation » Mendelian Inheritance

MCQ▾

Question

Mendel crossed a pure white-flowered recessive pea plant with a dominant pure red-flowered plant. The first generation of hydrids from the cross should show

Choices

Choice (4) Response

a.

75 % red-flowered and 25 % white-flowered plants.

b.

50 % white-flowered and 50 % red-flowered plants.

c.

All white-flowered plants.

d.

All red-flowered plants.

Question number: 19

» Genetics and Evolution » Heredity and Variation » Chromosomes and Genes

MCQ▾

Question

The evidence for crossing over which occurs at four stranded stage and not at two stranded stage of the chromosomes, comes from

Choices

Choice (4) Response

a.

Studies of meiosis in maize.

b.

Studies on linkage maps of chromosomes in Drosophila.

c.

4: 4 arrangement of ascospores in Neurospora.

d.

2: 2: 2: 2 arrangement of ascospores in Neurospora.

Question number: 20

» Genetics and Evolution » Molecular Basis of Inheritance » Gene Expression and Regulation

MCQ▾

Question

In operon concept, the regulator gene regulates chemical reactions in the cell by

Choices

Choice (4) Response

a.

Inhibiting migration of mRNA into cytoplasm.

b.

Inhibiting the substrate in the reaction.

c.

Inactivating enzymes in the reaction

d.

Inhibiting transcription of mRNA

Question number: 21

» Genetics and Evolution » Heredity and Variation » Chromosomes and Genes

MCQ▾

Question

Mendel proposed which of the following term for hereditary units?

Choices

Choice (4) Response

a.

Factor (Determiner)

b.

Genetic particle

c.

Genome

d.

None of the above

Question number: 22

» Genetics and Evolution » Heredity and Variation » Chromosomes and Genes

MCQ▾

Question

Mule is an offspring of

Choices

Choice (4) Response

a.

Male and female donkey

b.

Cow and ox

c.

Male horse and female ass

d.

Male ass and mare

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