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Give two examples in each case of (a) continuous, (b) discontinuous variation in human populations.
a) Continuous variation: for example, weight, height, intelligence, hair colour, skin colour, physique, blood pressure (any two).
b) Discontinuous variation: blood group, sex, eye colour (more or less), presence or absence of particular genetic diseases (e.g. albinism, haemophilia), free or attached ear lobes (any two).
Q. How do birds reproduce? Birds like every vertebrate have sexual reproduction. Their embryos develop within shelled eggs containing extraembryonic membranes and exterior the
When ATP gives energy to the cellular metabolism it loses one of its phosphates and ADP reappears. ADP can also lose more phosphates and produce AMP (adenosine monophosphate) o
Migration in birds
Pachytene: The pairing of homologous chromosomes is completed. Chromosomes become more and more thick. Each bivalent has four chromatids , which wrap around each o
Subdivisions of Ecology Ecology was earlier divided into plant and animal ecology. However, modem ecology does not make any such distinction since plants and animals are intima
Cytology of Endosperm Normally the young endosperm is triploid as it is formed by the fusion of three haploid nuclei (male gamete + upper polar nucleus + lower polar nucleus)
Which biological molecule contains the genetic information that controls cellular functioning
Define Planning for nutritional need For Adults? The term 'adult' refers to any individual in the age group of twenty years and above. The period beginning from twenty years an
CENSUS - Counting by government of each decade is called census. POPUL A TIO N OF WORLD - In 2000 - 6.1 billion. In children birth per day - 3,36,960 Popu
A home-made wormery A wooden box 30 cm by 30 cm by 15 cm fitted with a glass front is beneficial for studying the habits of earth-worms. Fill the box nearly to the top with
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