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Q. What are twins? Genetically what are the two types of twins that can be generated?
Twins are at the same time generated (within the mother's uterus) offspring. Twins classify according to zygosity as dizygotic or as monozygotic twins.
Monozygotic twins, also called as identical twins are those originated from one single fertilized ovum (therefore from one single zygote) and monozygotic twins are genetically identical that is they have identical genotypes and are necessarily of the same sex. Dizygotic twins also called as fraternal twins are those generated from two different ova fecundated by two different sperm cells and so they are not genetically identical and they are not necessarily of the same sex.
Explain why the chance of fertilisation in humans is restricted to only a few days each month. Sperms can fertilise an ovum for up to about three days after entering the female
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High salt concentrations can be toxic to plants as they have the potential to disrupt essential cell functions. Yet many halophytes sequester high amount of salt in their vacuoles,
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