Linkage and Crossing Over
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
More recombinants types are formed when

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

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 |

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

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

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

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?

The percentage of the F2 generation offspring showing parental character for the body colour and eye colour in Morgan's experiment is:

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

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

Distance between gene and percentage of linkage shows:

All genes located on the same chromosome ______.

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

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

In an experiment, 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

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

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

Which of the following brings variations among siblings?

The distance between the genes and percentage recombination shows:

The frequency of crossing over between any two linked genes is
