About Lesson
- An individual carrying the gametic chromosome number, n, is known as haploid.
- A monoploid, on the other hand, has the basic chromosome number, x.
- In euploids, the chromosome number is an exact multiple of the basic or genomic number.
- Euploidy is more commonly known as polyploidy. When all the genomes present in a polyploidy species are identical, it is known as autopolyploid and the situation is termed as autopolyploidy.
- In the case of allopolyploids, two or more distinct genomes are present.
- Euploids may have 3 (triploid), 4(tetraploid), 5 (pentaploid), or more genomes making up their somatic chromosome number.
- In case of autopolyploidy, they are known as autotriploid, autotertaploid, autopentaploid, and so on, while in the case of allopolyploidy they are termed as allotriploid, allotetraploid, allopentaploid, etc.
- Amphidiploid is an allopolyploid that has two copies of each genome present in it and, as a consequence, behaves as a diploid during meiosis. A segmental allopolyploid contains two or more genomes, which are identical with each other, except for some minor differences.
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