Which of the following is a test cross?

Important Questions on Principles of Inheritance and Variation

HARD

NEET

IMPORTANT

MTG OBJECTIVE NCERT AT YOUR FINGERTIPS BIOLOGY CLASS XI + XII>Chapter 28 - Principles of Inheritance and Variation>MCQS CORNER>Q 21

Fruit shape in shepherd's purse ($Capsella bursa$ ) is of two types- triangular and top-shaped. Triangular fruit shape (T) is dominant over top-shape (t). Following table summarises the results of several crosses.

Cross	Result
Strain $1\times$ tt	All triangular
Strain $2\times$ tt	$1$ triangular: $1$ top-shaped
Strain $3\times$ tt	All top-shaped
Strain $4\times$ Tt	$3$ triangular: $1$ top-shaped

Which pair of strains possess the genotype Tt?

EASY

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IMPORTANT

MTG OBJECTIVE NCERT AT YOUR FINGERTIPS BIOLOGY CLASS XI + XII>Chapter 28 - Principles of Inheritance and Variation>MCQS CORNER>Q 22

Mendel formulated the law of purity of gametes on the basis of

MEDIUM

NEET

IMPORTANT

MTG OBJECTIVE NCERT AT YOUR FINGERTIPS BIOLOGY CLASS XI + XII>Chapter 28 - Principles of Inheritance and Variation>MCQS CORNER>Q 23

Read the given statements and select the correct option.
Statement I: The law of segregation is one of the most important contributions to the biology.
Statement II: It introduced the concept of heredity factors as discrete physical entities which do not become blended.

MEDIUM

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IMPORTANT

MTG OBJECTIVE NCERT AT YOUR FINGERTIPS BIOLOGY CLASS XI + XII>Chapter 28 - Principles of Inheritance and Variation>MCQS CORNER>Q 24

The inheritance of flower colour in Antirrhinum (dog flower) is an example of ?

MEDIUM

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IMPORTANT

MTG OBJECTIVE NCERT AT YOUR FINGERTIPS BIOLOGY CLASS XI + XII>Chapter 28 - Principles of Inheritance and Variation>MCQS CORNER>Q 25

What will be the phenotypic ratio in ${\mathrm{F}}_2$ generation for the inheritance of flower colour be in Antirrhinum (dog flower) ?

MEDIUM

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IMPORTANT

MTG OBJECTIVE NCERT AT YOUR FINGERTIPS BIOLOGY CLASS XI + XII>Chapter 28 - Principles of Inheritance and Variation>MCQS CORNER>Q 26

Phenotypic and genotypic ratio is similar in case of

MEDIUM

NEET

IMPORTANT

MTG OBJECTIVE NCERT AT YOUR FINGERTIPS BIOLOGY CLASS XI + XII>Chapter 28 - Principles of Inheritance and Variation>MCQS CORNER>Q 27

In four O’clock plants, the gene for red flower colour (R) is incompletely dominant over the gene for white flower colour (r), hence the plants heterozygous for flower colour (Rr) have pink flowers. What will be the ratio of offsprings in a cross between red flowers and pink flowers?

MEDIUM

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IMPORTANT

MTG OBJECTIVE NCERT AT YOUR FINGERTIPS BIOLOGY CLASS XI + XII>Chapter 28 - Principles of Inheritance and Variation>MCQS CORNER>Q 28

Andalusian fowls have two pure forms - black and white. If black forms $\left(\mathrm{B}\mathrm{B}\right)$ and white forms $\left(\mathrm{W}\mathrm{W}\right)$ are crossed, F1 individuals appear blue coloured $\left(\mathrm{B}\mathrm{W}\right)$ , due to incomplete dominance. Which of the following would be an outcome of a cross between black form and blue form?