Genetics And Plant Breeding - Study Mode

[#126] Opaque-2 maize composition are richer as compared to normal maize in
Correct Answer

(A) Lysin

Explanation

Solution: Opaque-2 maize composition is richer as compared to normal maize in Lysin. Opaque-2 (o2) is a regulatory locus in maize that plays an essential role in controlling the expression of genes encoding the 22-kD zein proteins. Through DNase I footprinting and DNA binding analyses, we have identified the binding site for the O2 protein (O2) in the promoter of 22-kD zein genes. Opaque mutant enhances the lysine and tryptophan content in maize endosperm.

[#127] During hybdrid development using male sterility R line is used to
Correct Answer

(B) Bring fertility in male sterile plants

Explanation

Solution: During hybrid development using male sterility R line is used to bring fertility in male sterile plants. The restorer line is used to restore the fertility in the hybrid after crossing with the ms A line in the hybrid production plot. The availability of fertility restorer sources in sorghum made it easy to develop hybrids and to commercially use the CMS source in producing fertile hybrid seeds. Rf (R line) is a dominant allele for restoring male fertility and rf is its recessive allele inducing male sterility, in the presence of a male-sterile cytoplasm.

[#128] Botanically pineapple fruit is
Correct Answer

(A) Sorosis

Explanation

Solution: Botanically pineapple fruit is Sorosis. Sorosis is a fleshy fruit formed by the consolidation of many flowers with their receptacles, ovaries, etc, as the breadfruit, mulberry and pineapple. The individual fruits of the flowers join together to create multiple fruits. After the first fruit is produced, side shoots are produced in the leaf axils of the main stem. The ovaries develop into berries, which coalesce into large, compact, multiple fruits. The fruit of a pineapple is usually arranged in two interlocking helices.

[#129] Which one is the sequence of Pribnow Box?
Correct Answer

(B) TATAAT

Explanation

Solution: TATAAT is the sequence of Pribnow Box. The Pribnow box is a sequence of TATAAT of six nucleotides that is an essential part of a promoter site on DNA for transcription to occur in bacteria. It is an idealized or consensus sequence that is, it shows the most frequently occurring base at each position in many promoters analyzed, individual promoters often vary from the consensus at one or more positions. It is also commonly called the -10 sequence because it is centered roughly ten base pairs upstream from the site of initiation of transcription.

[#130] Sugarcane breeding institute, Coimbatore established in
Correct Answer

(B) 1944

Explanation

Solution: Sugarcane breeding institute, Coimbatore established in 1944. Sugarcane Breeding Institute is a central research institute in Coimbatore, India. It was established in 1912 and is affiliated with the Indian Council of Agricultural Research. It was established to promote research efforts in sugarcane production and is the only sugarcane research institute in the country.