Genetics And Plant Breeding MCQ Question and Answer | Agriculture MCQ Question

The location of various genes on a chromosome relative to specific microscopically visible landmarks on the chromosome is called a Cytogenetic map.
A cytogenetic map is the visual appearance of a chromosome when stained and examined under a microscope. Particularly important are visually distinct regions, called light and dark bands, which give each of the chromosomes a unique appearance.

In the gametophytic system of self-incompatibility, fully compatible will result from a cross between S₁S₂ × S₃S₄.
Gametophytic self-incompatibility, involves the inability of the gametes from the same parent plant to fuse and form a zygote or, if the zygote forms, then it fails to develop. These systems force outcrossing and maintain a wide genetic diversity.
The fully compatible progeny will result from a cross between S₁S₂ × S₃S₄.

In the pedigree method of breeding, all the following statements are correct, these are:
1. Plant selection is continued till the progenies become homozygous.
2. Plants are selected from F₂ on words and their progenies are tested.
3. It may be possible to study the precise nature of the inheritance of different characters by studying the pedigree records.
The pedigree method describes a selection protocol utilized during the inbreeding of populations of self- and cross-pollinated species in the development of homozygous lines.

Robert Hooke discovered the cell.
Robert Hooke was an English polymath active as a scientist and architect, who, using a microscope, was the first to visualize a micro-organism.
Hooke coined the term cell, suggesting plant structure's resemblance to honeycomb cells. He discovered the cell in 1665, the cell has a rich and interesting history that has ultimately given way to many of today's scientific advancements.

Resistance exhibited by adult plants is referred to as adult resistance.
Adult plant resistance (APR) is a phenomenon in which disease-resistance genes can confer resistance at the adult stages of the plant but somehow fail to do so at the seedling stages.
Despite the widespread occurrence of APR in various plant diseases, the mechanism underlying this trait remains obscure.

Designated inseparable seeds for wheat are Oat, Gram and Barley.
These are the plants of cultivated crops found in the seed field and whose seeds are so similar to crop seeds that are difficult to separate them economically by mechanical means.
Thus, oat, gram, and barley seed plants cannot be separated by mechanical means.

DNA can be formed by RNA-dependent DNA pol.
Reverse transcriptase (RT), also known as RNA-dependent DNA polymerase, is a DNA polymerase enzyme that transcribes single-stranded RNA into DNA.
This enzyme can synthesize a double helix DNA once the RNA has been reverse-transcribed in the first step into a single-strand DNA.

Leafy vegetables like palak, amaranthus, and spinach, are Highly cross-pollinated.
Cross-pollination is found in both angiosperms and gymnosperms and facilitates cross-fertilization and outbreeding.
Cross-pollination is the process of applying pollen from one flower to the pistils of another flower. Pollination occurs in nature with the help of insects and wind. This process can also be done by hand to produce offspring with desired traits, such as colour or pest resistance.

In wheat, an interspecific cross between Triticum aestivum and T. durum is partially fertile.
Interspecific hybridization is the crossing of two species from the same genus. This allows the exploitation of useful genes from wild, unimproved species for the benefit of the cultivated species.
The wheat variety obtained by a cross between T. aestivum and T. durum is partially fertile.

The correct chronological sequence of the event in the development of improved varieties or hybrids of plants are as follows:
1. Knight noted that male and female parents contributed equally to the F₁-generation.
2. Correns and de Vries rediscovered Mendel's laws of heredity.
3. Morgan discovered genes on chromosomes.
4. Tomato-carrying flavour gene is introduced.