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Who had proposed the chromosomal theory of inheritance?

Important Questions on Principles of Inheritance and Variation

EASY

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes

State Mendel’s law of independent assortment. Describe the law with an appropriate dihybrid cross.

HARD

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes

Mendel crossed a homozygous pea plant having yellow and round seeds with another pea plant bearing green and wrinkled seeds. He found that in some of the F₂ population, new combinations of the parental characters were observed. How will you explain the appearance of a new combination of the parental characters in F₂ offspring? Support your answer with the help of a Punnett square.

MEDIUM

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes

State Mendel’s law of independent assortment and explain it with the help of a cross between a homozygous yellow round (YYRR) and a green wrinkled (yyrr) pea plant. What will be the phenotype of the F₁ and F₂ progenies?

EASY

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes

A true breeding homozygous pea plant with round seeds and yellow cotyledons is crossed with homozygous pea plant with wrinkled seeds and green cotyledons.

State the Mendel's generalisation that can be derived from above cross.

EASY

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes

The maximum number of different gametes of the pollens produced by a tall pea plant with round, yellow, seeds of the genotype

TtRrYY

, if the three loci are unlinked, would be

HARD

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes

State the law of independent assortment. Explain with the hybrid cross of the pea plant.

MEDIUM

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes

Define chromosomal theory of inheritance.

MEDIUM

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes

In Golden Rice, thin grains are dominant over fat grains and straight leaves are dominant over wavy leaves. You are assigned to carry out a cross between two heterozygous dominant varieties for the above traits. Use appropriate symbols and derive the phenotypic ratios using Punnett square.

HARD

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes

A cross wạs carried out between two individuals, heterozygous for two pairs of genes. Assuming segregation and independent assortment, the number of different genotypes and phenotypes obtained respectively would be

MEDIUM

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes

In Morgan's experiment with Drosophila, when a yellow bodied white-eyed female was crossed with brown bodied red-eyed male and their

F_{1}

Progeny were intercrossed. What was the percentage of recombinants in the

F_{2}

generation?

EASY

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes

A true breeding homozygous pea plant with round seeds and yellow cotyledons is crossed with homozygous pea plant with wrinkled seeds and green cotyledons.

Work out the cross to show the phenotype and genotype ratio of F₁ and F₂ generations.

EASY

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes

A round seeded tall pea plant is crossed with round seeded dwarf plant and obtained progeny are with following phenotypes
$3$ - Tall, Round
$3$ - Dwarf, Round
$1$ - Tall, Wrinkled
$1$ - Dwarf, Wrinkled

The possible genotype of parents:

EASY

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes

Who proposed the chromosome theory of inheritance?

EASY

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes

Schematically represent the inheritance of two genes in pea plants with reference to seed colour and shape.

MEDIUM

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes

Define dihybrid cross. Explain Mendel's dihybrid cross experiment by checker board.

MEDIUM

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes

A cross between two plants with genotypes,

P p Q q

and

P p Q q

was carried out where

P

and

Q

are dominant over

p

and

q

, respectively. Of the total progeny obtained, the proportion of the offspring that would only express one of the two dominant alleles is

HARD

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes

Describe the chromosomal theory of inheritance. Distinguish between incomplete dominance and Co-dominance.

HARD

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes

Write the scientific name of the organism Thomas Hunt Morgan and his colleagues worked with for their experiments. Explain the correlation between linkage and recombination with respect to genes as studied by them.

MEDIUM

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes

Some of

F_{2}

progeny are formed during dihybrid cross between round and yellow

(\overset{↑}{o})

and wrinkled and green

(\overset{\circ}{+})

pea plants. Their genotypes are:

EASY

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of Two genes

Experimental verification of the chromosomal theory of inheritance was done by

Who had proposed the chromosomal theory of inheritance?

Important Questions on Principles of Inheritance and Variation

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