Biotechnology: Principles and Processes — BIOLOGY STD 12 Science — Question

Two heterozygous parents are crossed. If two loci are linked what would be the distrubution of phenotypic features in F₁ generation for a dihybrid cross.

Mention the importance of LH surge during menstrual cycle.

How has the bacterium Bacillus thuringiensis helped us in controlling caterpillars of insect pests?

Name any two organisms which can occupy more than one trophic level in an ecosystem.

Name the type of curve that characterises most population growing in favourable environment. Also define carrying capacity.

How PCR is used to detect bacterial and viral diseases and the gene mutation in cancer patient when the symptoms are not visible?

Do you think Mendel’s laws of inheritance would have been different if the characters that he chose were located on the same chromosome.

Cervix contains the largest and the strongest sphincter in its wall. Give reason.

In a certain population, the frequency of three genotypes is as follows:

Genotypes:	BB	Bb	bb
Frequency:	22%	62%	16%

What is the likely frequency of B and b alleles?

Describe the technique by which genetic disorder in a developing foetus can be detected.