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In earthworms, when the ovaries mature, the clitellum secretes a viscous substance in the form of a girdle. This girdle hardens in to a cocoon around the clitellum. The ova are discharged into cocoon. When this cocoon moves over the spermathecae openings, the sperms which are already collected from another worm and stored in the spermathecae are discharged into the cocoon. The cocoon finally, comes out of the body and fertilization takes place in the cocoon. As it is taking place outside the body, it is called as "external fertilization".
The allele that causes albinism (p) is recessive to the allele for normal pigmentation (P). A normal woman whose father is an albino marries an albino man whose parents are both no
Cleavage and Blastocyst Even though the cleavage is complete and all the blastomeres are of more or less equivalent size. Synchronization of mitoses in the blastomeres is los
CRITICISM OF DARWINISM - Arriva l of the fittest: Darwinism explains the survival of the fittest but was unable to account for the arrival of the fittest. V estigia
What key idea, contained in Malthus's essay on populations, helped Darwin formulates his theory of natural selection?
Q What are the fruiting bodies present in a few fungi? Fruiting bodies are structures made of hyphae that project radially from the superior portion of the peduncle of a few fu
Q. Duration limit of the QRS? The duration of the QRS is usually reduced slightly during exercise. Because catecholamines increase conduction velocity in the Purkinje fibers an
Classification of Nephrotic Syndrome In childhood, nephrotic syndrome can be divided into minimal lesion nephrofic syndrome and significant lesion nephrotic syndrome dependin
What was the case of Phineas Gage Some Procedures are not used experimentally on humans, but sometimes brain tissue is ablated for medical reasons such as the excision of tumo
Life forms are significant because
a) In what ways do farmers try to improve the quality of (i) their soil, (ii) their crop plants? b) What other steps do farmers take to maximise the yield from their
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