Molecular basis of Inheritance — BIOLOGY STD 12 Science — Question

Why is the frequency of red-green colour blindness is many times higher in males than that in the females?

Draw a labeled diagram of male reproductive system.

How does the transmission of each of the following diseases take place? - Malaria

What are the characteristic features of a true-breeding line?

What are chromatin? Why are they seen as ‘beads on string’ structure under electron microscope?

Describe the structure of mature angiospermic pollen grain. Mention one difference between the pollen of dicot and monocot.

Due to under peer pressure, a group of adolescents started using opioids intra venoualy. What are thc acrious problema they might face in future?

Three water samples namely river water, untreated sewage water and Secondary effluent discharged from Sewage treatment plant were subjected to BOD test. The samples were labelled in A, B and C; but the laboratory attendant did not note which was which. The BOD values of the three samples A, B and C were recorded as 20 mg/L, 8mg/L and 400mg/L, respectively. Which sample of the water is most polluted? Can you assign the correct label to each assuming the river water is relatively clean?

What is a tree line?

Name the enzymes which are employed in genetic engineering. Which of these you consider most specific and why?