Genetics And Plant Breeding - Study Mode

[#766] If 2n = 10 what will be the number of chromatids in each daughter cell after meiosis-I?
Correct Answer

(C) 10

Explanation

Solution: If 2n = 10, the number of chromatids in each daughter cell after meiosis-I will be 10. Meiosis is reductional division, thus after division chromosome number in each daughter cell is halved. Thus, the chromosome number in each daughter cell after meiosis-1 will be 5 if 2n= 10 and therefore, the number of chromatids will be 10.

[#767] Which of the following legume crop does not fix atmospheric nitrogen through symbiotic N. fixation?
Correct Answer

(A) Frenchbean

Explanation

Solution: French bean is the legume crop from the given option that does not fix atmospheric nitrogen through symbiotic N. fixation. Legumes can form a symbiotic relationship with nitrogen-fixing soil bacteria called rhizobia. Among all legume crops beans are considered to be poor nitrogen fixers.

[#768] BTT is associated with
Correct Answer

(A) Barley

Explanation

Solution: BTT is associated with Barley. The BTT as a tertiary trisomic constructed in such a way that the dominant allele of a marker gene, closely linked with the translocation breakpoint of the extra chromosome is carried on the extra chromosome, and the recessive allele is carried on the two normal chromosomes that constitute the diploid complement. The dominant marker gene may be located on the centromere segment or the trans-located segment of the extra chromosome.

[#769] First seed testing laboratory was opened under the guidance of
Correct Answer

(A) E. Moller Host in Denmark

Explanation

Solution: First seed testing laboratory was opened under the guidance of E. Moller Holst in Denmark. The Seed Testing Laboratory is the hub of seed quality control. Seed testing services are required from time to time to gain information regarding planting value of seed lots. Moller Holst, established a seed testing lab in Copenhagen, Denmark 1876 -1 st Seed Testing station in US 1900- Europe 130 Seed Testing Stations 1924- International Seed Testing Association (ISTA)-to develop procedures and to promote the uniform application.

[#770] Plants which grow in salt water is known as
Correct Answer

(A) Halophites

Explanation

Solution: Plants that grow in salt water are known as Halophytes. A halophyte is a salt-tolerant plant that grows in soil or waters of high salinity, coming into contact with saline water through its roots or by salt sprays, such as in saline semi-deserts, mangrove swamps, marshes and sloughs and seashores. Plants that avoid the effects of high salt even though they live in a saline environment may be referred to as facultative halophytes rather than 'true', or obligatory, halophytes.