Given below is a stretch of DNA showing the coding strand of a structural gene of a transcription unit?

5’--ATG ACC GTA TTT TCT GTA GTG CCC GTA CTT CAG GCA TAAβ€”3’

a) Write the corresponding template strand and the mRNA strand that will be transcribed, along with its polarity.
b) If GUA of the transcribed mRNA is an intron, depict the sequence involved in the formation of mRNA /the mature processed hnRNA strand.
i. In a bacterium
ii. In humans

c) Upon translation, how many amino acids will the resulting polypeptide have? Justify.

OR

In shorthorn cattle, the coat colours red or white are controlled by a single pair of alleles. A calf which receives the allele for red coat from its mother and the allele for white coat from its father is called a 'roan'. It has an equal number of red and white hairs in its coat.

a) Is this an example of codominance or of incomplete dominance?
b) Give a reason for your answer.
c) With the help of genetic cross explain what will be the consequent phenotype of the calf when

i. red is dominant over white
ii. red is incompletely dominant.


Solution



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