Genetics And Plant Breeding - Study Mode

[#221] Certification is not required for
Correct Answer

(A) Foundation seed

Explanation

Solution: Certification is not required for Foundation seed. The progeny of breeder seed is produced by recognized seed-producing agencies in the public and private sector, under the supervision of seed certification agencies in such a way that its quality is maintained according to prescribed field ad seed standards.

[#222] During differentiation, cells with the same DNA
Correct Answer

(D) May transcribe different genes

Explanation

Solution: During differentiation, cells with the same DNA May transcribe different genes. The cell types in a multicellular organism become different from one another because they synthesize and accumulate different sets of RNA and protein molecules. They generally do this without altering the sequence of their DNA. During the differentiation of pluripotent cells such as embryonic stem (ES) cells, pluripotency-associated genes are repressed, potentially permanently, as a result of DNA methylation.

[#223] The types of gametes will be produced by a species of genotype TtRr are
Correct Answer

(A) TR, Tr, tR, tr

Explanation

Solution: The types of gametes will be produced by a species of genotype TtRr are TR, Tr, tR, tr. All the offspring will be hybrid (heterozygous) tall, red flowering (TtRr). Since the genes for height are on a different pair of chromosomes from the genes for flower colour, the genes assort independently. This allows for four different types of "gametes" to form: TR, Tr, tR and tr.

[#224] Physical basis of life is
Correct Answer

(C) Protoplasm

Explanation

Solution: The physical basis of life is Protoplasm. The protoplasm is the living part of a cell that is surrounded by a plasma membrane. Protoplasm is physically translucent, granular slimy, semifluid, or viscous. In it, granules of different shapes and sizes are suspended in solution. It is a mixture of small molecules such as ions, monosaccharides, and amino acids, and macromolecules such as proteins, polysaccharides, lipids, etc.

[#225] The endosperm in which nuclear divison is accompanied by cell wall formation is
Correct Answer

(A) Cellular endosperm

Explanation

Solution: The endosperm in which nuclear division is accompanied by cell wall formation is Cellular endosperm. The endosperm is a tissue produced inside the seeds of most flowering plants following double fertilization. In cellular endosperm formation, cell-wall formation is coincident with nuclear divisions. In endosperm formation, a cell wall is laid down between the first two nuclei, after which one half develops endosperm along the cellular pattern and the other half along the nuclear pattern.