Genetics And Plant Breeding - Study Mode
[#631] Which experiment proved that DNA is the genetic material?
Correct Answer
(A) Transformation
Explanation
Solution: The transformation experiment proved that DNA is the genetic material. One of several processes by which genetic material in the form of “naked” deoxyribonucleic acid (DNA) is transferred between microbial cells. Its discovery and elucidation constitute one of the significant cornerstones of molecular genetics.
[#632] In humans, an XO individual has how many barr body in her cells
Correct Answer
(D) None of these
Explanation
Solution: In humans, an XO individual has no Barr body in her cells. A Barr body or X-chromatin is an inactive X chromosome in a cell with more than one X chromosome. Someone with two X chromosomes (such as most human females) has only one Barr body per somatic cell , while someone with one X chromosome (such as most human males) has none. Thus as an XO individual has only one X chromosome therefore there will not be any Barr body in its cells.
[#633] The mitochondria term is coined by
Correct Answer
(A) Benda
Explanation
Solution: The mitochondria term is coined by Carl Benda. Mitochondria have a double membrane structure and use aerobic respiration to generate adenosine triphosphate (ATP), which is used throughout the cell as a source of chemical energy. They were discovered by Albert von Kolliker in 1857 in the voluntary muscles of insects. The term mitochondrion was coined by Carl Benda in 1898.
[#634] In wheat, cross-pollination is
Correct Answer
(B) < 5%
Explanation
Solution: In wheat, cross-pollination is < 5%. Wheat is a self-pollinating crop that produces seed when pollen from anthers fertilizes the receptive ovary in the same flower of a single-parent plant. Wheat commonly is crossed by hand pollination or by approach crossing, so both methods are illustrated. Approach crossing can be used effectively to obtain crossed seeds with a minimum of labour in both the field and greenhouse. Thus, cross-pollination in wheat is < 5%.
[#635] Degeneration of Genetic codon is attributed to
Correct Answer
(C) 3 rd member of codon
Explanation
Solution: Degeneration of Genetic codon is attributed to 3 rd member of the codon. Degeneracy or redundancy of codons is the redundancy of the genetic code, exhibited as the multiplicity of three-base pair codon combinations that specify an amino acid. The degeneracy of the genetic code accounts for the existence of synonymous mutations. It results because there are more codons than encodable amino acids.