Linkage and Crossing over

Select out the correct statement:

Males of silkworm Bombyx mori are known to produce more silk per unit quantity of leaf consumed. Hence, they are preferably bred in sericulture industry. Which of the following genotypes should be crossed in order to get maximum fraction of male insects?

Note: ${\mathrm{SL}}_1$ and ${\mathrm{SL}}_2$ are sex-linked recessive lethal mutations.

In a dihybird cross between two heterozygotes, AaBb x AaBb, if we get 3:1 ratio among the offspring, the reason for this may be:

Match the following.

A plant heterozygous for height and flower colour $\left(\mathrm{TtRr}\right)$ 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 $\left(\mathrm{ttrr}\right)$$?$ 

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

The two genes are $70 \mathrm{cM}$ 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.

$\begin{array}{ccc}\mathrm{Red-eye} \mathrm{and plain} thorax & \mathrm{X }& \mathrm{P}\mathrm{i}\mathrm{n}\mathrm{k-}\mathrm{e}\mathrm{y}\mathrm{e} \mathrm{and} \mathrm{striped} thorax\end{array}$

The ${\mathrm{F}}_1$ flies were then test crossed against the double recessive.

The following F2 generation resulted from the cross:
 

A. The physical association between the two genes is termed as $\text{\_\_\_\_a\_\_\_\_}$.
B. The generation of non-parental gene combination is termed as $\text{\_\_\_\_b\_\_\_\_}$ .

In an experiment, $\mathrm{A}\mathrm{a}\mathrm{B}\mathrm{b\; obtained\; in\; the}\mathrm{ }\left(\mathrm{F}1\right)$ 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: