Out of many papaya plants growing in your garden, only a few bear fruits. Give reason.
Papaya is dioecious because the staminate and pistillate flowers are born on two different plants. Self fertilization is not found in papaya, thus in different plants the flower may be developing at different time and that is why few plants having fruits
Explain enzyme-replacement therapy to treat adenosine deaminase deficiency. Mention two disadvantages of this procedure.
How do homologous organs represent divergent evolution ? Explain with the help of a suitable example.
Write the two limitations of traditional breeding technique that led to promotion of micro-propagation.
Mention two advantages of micro propagation.
Give two examples where it is commercially adopted.
It is generally observed that the children who had suffered from chicken - pox in their childhood may not contract the same disease in their adulthood. Explain giving reasons the basis of such an immunity in an individual. Name this kind of immunity.
Name two hormones that are constituents of contraceptive pills. Why do they have high and effective contraceptive value ? Name a commonly prescribed non-steroidal oral pill.
(a) What do 'Y' and 'B' stand for in 'YAC' and 'BAC' used in Human Genome Project (HGP). Mention their role in the project.
(b) Write the percentage of the total human genome that codes for proteins and the percentage of discovered genes whose functions are known as observed during HGP.
(c) Expand 'SNPs' identified by scientists in HGP.
