Evolution — BIOLOGY STD 12 Science — Question

In a dihybrid cross carried out by T.H. Morgan in Drosophila, the F, ratio deviated from that of Mendel's dihybrid F, ratio. Give a reason.

Or

Why do certain genes tend to be inherited together in a cell at the time of cell division?

Or

If the frequency of a parental form is higher than 25% in a dihybrid test cross, what does that indicate about the two genes involved?

Name the enzyme that joins the small fragments of DNA of a lagging strand during DNA replication.

State the function of filiform apparatus found in mature embryo sac of an angiosperm.

How many base pairs are present in a nucleosome?

Name an IUD that you would recommend to promote the cervix hostility to sperms.

Give the name of plant from which we get cocaine.

Who is the ‘Father of Genetics’?

Mention the role of Restriction enzyme in Recombinant DNA technology.

Name the ‘landing’ platform for pollen grains.

Name any two sanctuaries in India.