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Flaws in Developmen of Human
The human growth and development in spite of its complexity works perfectly most of the time. But while development goes awry it creates a giant or dwarf, a child along with multiple fingers or toes an albino or haemophilic or even worse than these. All birth defects are loosely grouped like 'congenital defects'. Causes for birth defects can be sought in three general areas; defective genes, abnormal arrangements of chromosomes and not favorable factors occurring in the uterine environment throughout pregnancy. The list of hereditary birth defects is long and in some cases the particular chemical defects because of defective genes is known, for instance, Haemophilia, sickle cell, thalassemia, anaemia and phenylketonuria. But not all genetic defects are inherited. In a number of embryos the genetic instructions that govern growth are primarily correct but somewhere during cell divisions the instructions become garbled and mishaps of this son generally involve not a single defective gene but a complete rearrangement, of the cell's genetic material. Down's syndrome is one such example.
Which of the following is NOT a process that may provide an adaptive advantage to eukaryotic chromosomes?.tion..
In a numeric pyramid to which trophic level does the base always refer? What about the top level? In a numeric pyramid the base corresponds to the first trophic level, i.e., to
Osmoregulation in Terrestrial Environment Earlier you have learnt about osmoregulation in aquatic environment. In this section, we shall study how the terrestrial animals cop
Lotic Ecosystems Rivers The lotic or flowing water habitats include rivers streams, brooks etc. The most outstanding features of such habitats is the continuously flowing wat
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
Enumerate about the colour vision defects Acquired colour vision defects can occur afkr damage to the optic nerve or macula and in some cases, because of blue blindness in old
Community Change Ecosystems are dynamic entities in which a number of events take place. Associated with the biotic communities of the ecosystem are some changes, which may be
What are the functions of insulin and glucagon for the blood glucose control? Glucagon enhances glycemia and insulin reduces it. They are antagonistic pancreatic hormones. Gluc
definition of larva
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