Q2 of 31 Page 1

State a method of cellular defense which works in all eukaryotic organisms

RNA interference is a method of cellular defense that takes place in all the eukaryotic organisms. RNA interference (RNAi) is a biological process used by all eukaryotic organisms to regulate the activity of genes. In this process RNA molecules prevent expression of genes.


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1

A tissue, of a tobacco plant, infected with TMV was used to obtain a new plant. Identify the technique used and reason out the possibility of obtaining a new healthy plant.

 3

In case of an infertile couple, the male partner can inseminate normally but the mobility of sperms is below 40 percent. Which kind of ART is suitable in this situation to form an embryo in the laboratory conditions, without involving a donor?

 4

Write the two components of the first artificial recombinant DNA molecule constructed by Cohen and Boyer.

 5

A cross was carried out between two pea plants showing the contrasting traits of height of the plant. The result of the cross showed 50% of parental characters. Name the type of cross.