Genetics And Plant Breeding - Study Mode
[#526] 'Origin of species' was published in
Correct Answer
(B) 1859
Explanation
Solution: 'Origin of species' was published in 1859. On the Origin of Species utilizing Natural Selection, a groundbreaking scientific work by British naturalist Charles Darwin is published in England on 24 th November 1859. Darwin's theory argued that organisms gradually evolve through a process he called “natural selection”. The book presented a body of evidence that the diversity of life arose by common descent through a branching pattern of evolution.
[#527] The histones of DNA are synthesized in
Correct Answer
(C) S phase
Explanation
Solution: The histones of DNA are synthesized in the S phase. The new histones are made in the cytoplasm during the S phase and are transported into the nucleus. It is deposited by chromatin assembly factors or histone chaperones on replicating DNA to form chromatin in a process known as chromatin assembly. The old histones are disassembled from DNA, presumably shielded and chaperoned until they are reassembled into nucleosomes.
[#528] Match the following columns: Column I Column II a. Telomeres 1. Complete linkage b. Genes located in different chromosome 2. Fruit fly c. Gene closely located in chromosomes 3. Chromosome ends d. Four linkage groups 4. Unlinked gene
Correct Answer
(A) a-3, b-4, c-1, d-2
Explanation
Solution: a. Telomeres is the point or region at the end of the chromosome. Telomeres protect the ends of chromosomes from becoming frayed or tangled. Each time a cell divides, the telomeres become slightly shorter. b. Gene located in a different chromosome is unlinked gene. Unlinked genes may be on different chromosomes, or so far apart on the same chromosome that they are often separated by recombination. c. Gene closely located in chromosomes leads to complete linkage. It linkage between genes that are located close together on the same chromosome with no crossing over between them. d. Four linkage groups are present in Fruit fly. In fruit fly, there are four pair of chromosomes: three are autosomal pairs and one pair of sex chromosomes. Genes present on one chromosome form a linkage group.
[#529] Green Revolution in India occurred during
Correct Answer
(B) 1960
Explanation
Solution: Green Revolution in India occurred in 1960. The Green Revolution in India was initiated in the 1960s by introducing high-yielding varieties of rice and wheat to increase food production to alleviate hunger and poverty. It was a period that began in the 1960s during which agriculture in India was converted into a modern industrial system by the adoption of technology, such as the use of high-yielding variety (HYV) seeds, mechanized farm tools, irrigation facilities, pesticides and fertilizers.
[#530] Verticillaster inflorescence is a character of
Correct Answer
(D) Labiatae
Explanation
Solution: Verticillaster inflorescence is a character of Labiatae. Labiatae is a family of flowering plants as the mint or deadnettle or sage family. Verticillaster inflorescence is a flower cluster that looks like a whorl of flowers but consists of two crowded clusters. The leaves emerge oppositely, each pair at right angles to the previous one (decussate) or whorled.