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

A cross between a normal couple resulted in a son who was haemophilic and a normal daughter. In course of time, when the daughter was married to a normal man, to their surprise, the grandson was also haemophilic.
Represent this cross in the form of a pedigree chart. Give the genotypes of the daughter and her husband.

Mention any four benefits derived from transgenic animals.

Explore various components of nutrient medium used for leaf explant culture.

Incomplete dominance.

Mention the characteristics found in endoparasites.

ELISA technique is based on the principles of antigen-antibody interaction. Can this techique be used in the molecular diagnosis of a genetic disorder, such as phenyketonuria?

In a certain population, the frequency of three genotypes is an followers.
Genotypes: BB Bb bb
Frequency: 22% 62% 16%
What is the likely frequency of B and b alleles?

A woman has certain queries as listed below, before starting with contraceptive pills. Answer them.

1. What do contraceptive pills contain and how do they act as contraceptives?
2. What schedule should be followed for taking these pills?

Which layer of uterus undergoes cyclic changes during the menstrual cycle?

What does the term 'memory' of the Immune system mean?