Linkage and Crossing Over

IMPORTANT

Linkage and Crossing Over: Overview

This topic covers concepts such as Linkage, Linkage Groups, Mechanism of Linkage, Crossing Over, and Linkage Maps.

Important Questions on Linkage and Crossing Over

MEDIUM
IMPORTANT

More recombinants types are formed when

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IMPORTANT

Which of the following is not a characteristic of Drosophila melanogaster?

EASY
IMPORTANT

Match the following.

  Column I   Column II
(a) T. H. Morgan (i) Chromosome theory
(b) Hugo de Vries (ii) Gene mapping
(c) Sutton and Boveri (iii) Linkage
(d) Alfred Sturtevant (iv) Mutation
    (v) Hybrid experiments

MEDIUM
IMPORTANT

A plant heterozygous for height and flower colour TtRr are selfed and 1600 of the resulting seeds are planted. If the distance between the loci controlling height and the flower colour is 1 centiMorgan (cM), then how many offsprings are expected to be short with white flower ttrr? 

MEDIUM
IMPORTANT

In Drosophila, the genes for the body color and eye color are present on:

MEDIUM
IMPORTANT

The two genes are 70 cM apart. Then the frequency of recombination is:

MEDIUM
IMPORTANT

Which of the following is not true about linkage considering body colour and eye colour of the fruit fly, in the experiment performed by Morgan?

EASY
IMPORTANT

The percentage of the Fgeneration offspring showing parental character for the body colour and eye colour in Morgan's experiment is:

EASY
IMPORTANT

Genes located very close to one another on the same chromosome tend to be transmitted together and are called _____.

EASY
IMPORTANT

Mendel's law of independent assortment does NOT hold true for the genes that are located closely on

EASY
IMPORTANT

Distance between gene and percentage of linkage shows:

EASY
IMPORTANT

All genes located on the same chromosome ______.

MEDIUM
IMPORTANT

True-breeding red-eyed Drosophila flies with plain thorax were crossed with pink-eyed flies with striped thorax.

Red-eye and plain thorax Pink-eye and striped thorax

The F1 flies were then test crossed against the double recessive.

The following F2 generation resulted from the cross:
 

80 16 12 92
Red-eye Red-eye Pink-eye Pink-eye
Plain thorax Striped thorax Plain thorax Striped thorax

What percentage number of recombinants resulted from the test cross?

MEDIUM
IMPORTANT

A. The physical association between the two genes is termed as ____a____.
B. The generation of non-parental gene combination is termed as ____b____ .

EASY
IMPORTANT

In an experiment, AaBb obtained in the F1 generation was test crossed. In the progeny, genotype Aabb and aaBb were more frequent than AaBb and aabb. Then the genotype of the parents should be

MEDIUM
IMPORTANT

Which of these statements is correct regarding genes present on the same chromosome?

EASY
IMPORTANT

Which of these characters cannot be transferred from a male parent to a male progeny in Drosophila?

MEDIUM
IMPORTANT

Which of the following brings variations among siblings?

EASY
IMPORTANT

The distance between the genes and percentage recombination shows:

EASY
IMPORTANT

The frequency of crossing over between any two linked genes is