According to Chargaff’s rule the ratio of Purines : Pyrimidines in a double stranded DNA, is a constant for a given species .This ratio Read More …
Category: Class 12
Give an account of any 3 benefits of transgenic animals to humans
Any three of the below can be written : Transgenic animals are used – To study how genes are regulated, and how they affect Read More …
Describe the method of separation& isolation of DNA fragments . OR Explain the technique of gel electrophoresis used to separate DNA fragments in biotechnology .
The molecule of DNA can be cut by the enzyme restriction endonucleases. These fragments of DNA can be separated by a technique known as Read More …
How was the invasive prickly pear cactus brought under control?
Biological control – Introducing a predator moth species feeding on cactus controlled the prickly pear cactus in Australia.
Gene therapy is a corrective for hereditary diseases. Justify using suitable examples.
Gene therapy is a collection of methods that allows correction of a gene defect that has been diagnosed in a child / embryo. Correction Read More …
Describe in detail The pattern of inheritance in incomplete dominance & co – dominance.
Incomplete dominance : All traits in most organisms did not follow Mendel’s Laws of dominance. Eg.Flower colour in Snapdragon (Antirrhinum sp.): When true-breeding red-flowered Read More …
Explain how emasculation & bagging techniques help to achieve artificial hybridisation?
Emasculation – The pollen and anthers are cut off from the flower, so as to avoid self pollination Bagging – Covering the emasculated flower Read More …
The state health department wants to implement a project to create awareness about reproduction related aspects in villages. Explain the various activities that they would take up to promote their campaign.
India was among the 1st countries to initiate actions & plans to attain total reproductive health as social goal. These programmes are called as Read More …
A young lady during parturition fails to develop foetal ejection reflex. What treatment would the doctor give her immediately ?
Foetal ejection reflex are the mild uterine contractions which happens as a neuroendocrine mechanism when fully developed fetus sends signals which triggers the maternal Read More …
A couple visited a fertility clinic to treat their infertility. suggest & explain a method which would enable them to have a child using their own gametes.
Assisted reproductive technologies (ART) – Test Tube Baby / IVF- invitro fertilisation – the ova of the wife, and sperms from the husband are Read More …