Genetics And Plant Breeding - Study Mode

[#656] A cybrid is a
Correct Answer

(B) Hybrid formed by cell division

Explanation

Solution: A cybrid is a hybrid formed by cell division. Cybrids are eukaryotic cell lines produced by the fusion of a cell that serves as a nuclear donor, and a cytoplast from a different source, serving as a mitochondrial donor. Cybrids are produced by combining cytoplasm from nucleated cells with non-nucleated cells or cytoplasts. The nucleated cell can be unaltered or could have undergone depletion of endogenous mtDNA before cytoplasmic mixing.

[#657] The term Genetics was given by
Correct Answer

(B) Bateson

Explanation

Solution: The term Genetics was given by Bateson. William Bateson was an English biologist who was the first person to use the term genetics to describe the study of heredity. Bateson first suggested using the word "genetics" to describe the study of inheritance and the science of variation in a personal letter to Adam Sedgwick dated 18 th April 1905. Bateson first used the term "genetics" publicly at the Third International Conference on Plant Hybridization in London in 1906.

[#658] Pure line selection is mainly done for
Correct Answer

(C) Self-pollinated crops

Explanation

Solution: Pure line selection is mainly done for Self-pollinated crops . Pure-line selection involves selecting and breeding progeny from superior organisms for several generations until a pure line of organisms with only the desired characteristics has been established. Basically, a pure line refers to a progeny of a single, homozygous, and self-pollinated plant.

[#659] Cytoplasmic sterility is governed by
Correct Answer

(B) Plasma genes

Explanation

Solution: Cytoplasmic sterility is governed by Plasma genes. Cytoplasmic male sterility is under extranuclear genetic control. It shows non-Mendelian inheritance, with male sterility inherited maternally. In general, there are two types of cytoplasm: N (normal) and aberrant S (sterile) cytoplasms. And plasma genes are a self-replicating extranuclear determiner of hereditary characteristics.

[#660] If the plant is infected with one diseae, it makes the plant resistant to other disease. This phenomenon is known as
Correct Answer

(C) Cross protection

Explanation

Solution: If the plant is infected with one disease, it makes the plant resistant to other diseases. This phenomenon is known as Cross protection . Cross-protection, also known as “pre-immunization" is a method of plant virus control, whereby a plant is deliberately infected with a mild strain of a virus to protect the plant against damage caused by a more severe strain of the same virus.