Sexual Reproduction in Flowering Plants — BIOLOGY STD 12 Science — Question

What is recombination? Discuss the applications of recombination from the point of view of genetic engineering.

What do you understand by the term population explosion? What are the reasons for population explosion?

Write a short note on
Behavioural adaptations in animals

Observe the diagram of Genetic code and answer the following questions:

i. How many codons codes for amino acids and how many do not?
ii. Explain the following giving one example of each.
a. Unambiguous and specific codon
b. Degeneration codon
c. Universal codon
d. Initiator codon

In the diagram given below, show the path of a pollen tube from the pollen on the stigma into the embryo sac. Name the components of egg apparatus.

How is DNA recombinant technology helpful in detecting the presence of mutated genes in the cancer patients?

What is cleavage?

Given below is the representation of amino acid composition of the relevant translated portion of B-chain of haemoglobin, related to the shape of human red blood cells.

1. Is this representation indicating a normal human or a sufferer from certain related genetic disease? Give reason in support of your answer.
2. What difference would be noticed in the phenotype of the normal and the sufferer related to this gene?
3. Who are likely to suffer more from the defect related to the gene representedthe males, the females or both males and females equally? And why?

Enumerate and describe any five reasons for introducing sex education to school-going children.

Write a short note on Biopiracy highlighting the exploitation of developing countries by the developed countries.