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Cleavage - Development Biology
Cleavage or segmentation is a series of cell divisions of the fertilized .egg through which it is converted into a multicellular structure, called blastula. The main characteristics of cleavage include:
The cell divisions in the somatic cells are mitotic. The daughter cells or blastomeres or cleavage cells are also derived as a result of mitotic divisions of the zygote. We may ask whether there are any differences between mitotic divisions of somatic cells and, of the zygote and the blastomeres derived from it during cleavage.
State the prevention of Campylobacteriosis Prevention: the various ways to prevent campylobacteriosis are: Wash hands before preparing foods. Wash hands immediatel
Sex Determination - Reproduction Sex, whether an individual will be a male or a female is determined at fertilisation, and this directs and controls all the later processes i
What is the disease caused by vitamin D deficiency? Which tissue does it affect? The lack of vitamin D causes the disease called as rickets (rachitis), characterized by decalci
In what ways can we try to protect a species from extinction? We can attempt to protect species from extinction by making it illegal to kill the threatened animals or uproot o
Define Objectives to know about methods of food processing? After studying this unit, you will be able to: Enumerate the different methods of food processing Enlist
COMMUNITY If you look around yourself you will notice that populations of plants and animals seldom occur by themselves. The reason for this is quite obvious. In order to survive
Q. What are compound eyes? Arthropods have compound eyes made of several visual units called as ommatidia. Each ommatidium transmits visual information through the optic nerve
Alteration of Turgor of Guard Cells There are two ways in which the relative turgor of guard cells may be altered. A decrease in osmotic potential or A decre
Define Sporangiophore - Types of Hyphae? Sporangiophore - Tufts of special, erect unbranched, hyphae growing in air arise from stolon just opposite to rhizoids. These are s
Which type of genetic disease can be identified from the visual analysis of the number of chromosomes present in a karyotype? The counting and the identification of chromosomes
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