Purelines appear due to continuous inbreeding or self that makes the similarity in gene pairs. Thus, variations in pure lines are only environmental & Read More …
Category: Science
What are pleotropic genes?
Gene with multiple effect.
Mention the advantages of selecting Pea plant for the experiments by Mendel ?
The advantages of selecting Pea plant for the experiments by Mendel are: Pea plants have a short life cycle. They are easy to grow Read More …
Life processes. Q bank
Fill in the blanks: ————— is a fluid connective tissue. ———— is the filtration unit of kidney. An example of anaerobic respiration is ————- Read More …
Describe in detail the structure of DNA polynucleotide chain.
A nucleotide has three components – a nitrogenous base, a pentose sugar deoxyribose , and a phosphate group. There are two types of nitrogenous Read More …
Discuss the origin and evolution of Man.
Name 1st appeared characteristics Brain capacity place diet Dryopithecus & Ramapithecus 15 million years ago (MYA) Hairy, Ape like gait Ramapithecus more Read More …
Describe the role of Restriction enzymes in Biotechnology?
Restriction enzymes cut DNA molecules at a particular point by recognising a specific sequence . They are of two kinds – Exonucleases – remove Read More …
Name two core techniques that helped develop biotechnology.
i) Genetic engineering : Techniques to alter the chemistry of genetic material & to introduce these into host organisms and thus change the phenotype of Read More …
Explain surgical methods and IUD’s are used in controlling human population.
Surgical method or sterilisation is a terminal method to prevent any more pregnancies. Surgical intervention blocks gamete transfer so as to prevent conception. In males it is called ‘vasectomy’, Read More …
Describe Biomagnification of DDT in an aquatic food chain.
Biomagnification refers to increase in concentration of the toxicant at successive trophic levels due to accumulation of a toxic substance by an organism. The toxic Read More …
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