Genetics And Plant Breeding - Study Mode
[#451] The progeny of nucleus seed is called
Correct Answer
(A) Breeder seed
Explanation
Solution: The progeny of the nucleus seed is called Breeder seed. This is the hundred percent genetically pure seeds with physical purity produced by the original breeder from basic nucleus seed stock. Breeder seed is produced by or under the direction of the plant breeder who selected the variety. During breeder seed production, the breeder or an official representative of the breeder selects individual plants to harvest based on the phenotype of the plants. A pedigree certificate is issued by the producing breeder.
[#452] Reverse transcriptase is
Correct Answer
(B) DNA dependent RNA polymerase
Explanation
Solution: Reverse transcriptase is DNA-dependent RNA polymerase. Reverse transcriptase (RT), also known as RNA-dependent DNA polymerase, is a DNA polymerase enzyme that transcribes single-stranded RNA into DNA. This enzyme can synthesize a double helix DNA once the RNA has been reverse-transcribed in the first step into a single-strand DNA.
[#453] Jumping genes are called
Correct Answer
(C) Transposon
Explanation
Solution: Jumping genes are called Transposon. It is a nucleic acid sequence in DNA that can change its position within a genome, sometimes creating or reversing mutations and altering the cell's genetic identity and genome size. Transposable elements make up a large fraction of the genome and are responsible for much of the mass of DNA in a eukaryotic cell. Transposons are also very useful to researchers as a means to alter DNA inside a living organism.
[#454] In a synthetic variety of maize produced by combining 10 lines, the loss of excess vigour in F 2 generation will be
Correct Answer
(A) 1 / 10
Explanation
Solution: In a synthetic variety of maize produced by combining 10 lines, the loss of excess vigour in F 2 generation will be 1 / 10 . Under the dominance hypothesis, detrimental recessive alleles accumulate in the homozygous state during inbreeding and cause a reduction in vigour or inbreeding depression. As the synthetic variety is produced by combining 10 lines, therefore the loss of excess vigour in F 2 generation will be 1 upon 10.
[#455] The first interspecific cross between carnation and sweet William species of Dianthus was made up of
Correct Answer
(A) Thomas Fairchild (1717)
Explanation
Solution: The first interspecific cross between carnation and sweet William species of Dianthus was made up by Thomas Fairchild (1717). Thomas Fairchild an Englishman 1717 produced an interspecific cross between Sweet William (Dianthus barbatus L.) as female and Carnation (Dianthus caryophyllus) as the pollen parent and the product was known as Fairchild's Sweet William (also called Fairchild's Mule), which was sterile.