Biotechnology — BIOLOGY STD 12 Science — Question

Give an example of each of the following cases, where:

1. The sperm is responsible.
2. The ovum is responsible, for sex determination.

Molecular scissors used in recombinant DNA technology are known as.

What are molecular scissors? Why are they so called?

Which variety of sugar cane having high sugar content and better yield is cultivated in South India?

Give definitions: Placenta

How many linkage groups are present in Drosophila melanogaster?

In case of an infertile couple, the male partner can inseminate normally but the mobility of sperms is below 40 per cent. Judge, which kind of ART is suited in this situation to form an embryo in the laboratory, without involving a donor?

Write the role of histone protein in packaging of DNA in eukaryotes.

Mention the role of the codons AUG and UGA during protein synthesis.

Name the ectoparasites which infest the marine fish.