Genetics And Plant Breeding - Study Mode

[#156] Cross-pollination is associated with
Correct Answer

(A) Dichogamy

Explanation

Solution: Cross-pollination is associated with Dichogamy. Cross-pollination is the process of applying pollen from one flower to the pistils of another flower. Dichogamy refers to the maturation of anthers and stigma of the same flowers at different times. It promotes cross-pollination even in the hermaphrodite species.

[#157] Bulk population breeding is suitable for
Correct Answer

(C) Small grain crops

Explanation

Solution: Bulk population breeding is suitable for Small grain crops. Bulk population breeding is suitable for small grain crops. Bulk population breeding is a strategy of crop improvement in which the natural selection effect is solicited more directly in the early generations of the procedure by delaying stringent artificial selection until later generations.

[#158] Termination codons are
Correct Answer

(B) UAA, UAG, UGA

Explanation

Solution: Termination codons are UAA, UAG, UGA. A set of three adjacent bases in the DNA or their complementary bases in messenger RNA that specifies the end of a polypeptide chain. The three chain-termination codons (in messenger RNA) are UAA, UAG and UGA. They are also called termination codons, stop codons or nonsense codons.

[#159] Match the following columns: Column I (Scientist) Column II (Invention) a. Robert Brown 1. Endoplasmic reticulum b. Benda 2. Mitochondria c. Dave 3. Lysosome d. Porter 4. Nucleus
Correct Answer

(D) a-4, b-2, c-3, d-1

Explanation

Solution: a. Robert Brown invented Nucleus in 1831, in a talk at the Linnean Society of London. Brown was studying orchids under the microscope when he observed an opaque area, which he called the "areola" or "nucleus", in the cells of the flower's outer layer. b. Benda invented Mitochondria. Benda first became aware of the existence of hundreds of these tiny bodies in the cytoplasm of eukaryotic cells and assumed that they reinforced the cell structure. Because they tended to form long chains, he coined the name mitochondria ("thread granules"). c. Dave invented Lysosome. He made serendipitous discoveries of two cell organelles, peroxisome, and lysosome, for which he shared the Nobel Prize in Physiology or Medicine in 1974. d. Porter invented the Endoplasmic reticulum. The endoplasmic reticulum is one of the most intriguing and fascinating organelles. It is found in all eukaryotic cells and performs an amazing number of different functions. The organelle was named by Keith Porter in 1953.

[#160] The common form of DNA present in the living organisms is the
Correct Answer

(D) B form

Explanation

Solution: The common form of DNA present in living organisms is the B form. The most common form, present in most DNA at neutral pH and physiological salt concentrations, is B-form. That is the classic, right-handed double helical structure. Canonical B-DNA is a double helix made of two antiparallel strands that are held together via hydrogen bonding in the A•T and G•C base pairs.