Question

Varieties of the same plant have 14, 28, 42, 56, and 70 chromosomes. All are multiples of a set of seven chromosomes.

How would you describe these varieties genetically?

	A.	allopolyploids
	B.	amphipolyploids
	C.	autopolyploids
	D.	aneuploids

Answer 1

Answer- C. Autopolyploids.

Explanation- Scientist Lutz first defined the term Polyploidy. It can be defined as organism have more than two copy of whole genome. It is of generally two types.

i) Autopolyploidy- It is defined as when the organism have more than two, three, four, five like the basic multiple number of whole genome of a particular species, they are known as autopolyploids. An autotetraploid have four set of genome.

ii) Allopolyploidy- However in case of allopolyploids they have the multiple of basic number of genome set from two different species. Allotetraploid also have four set of chromosome but from two different species.

Allopolyploids are usually sterile. When the sterile allopolyploids crossed, the offspring of this cross often found to be fertile. As allopolyploids are originated by crossing between two different species.

Aneuploidy is referred as when the organism has an or more than one additional chromosome to its whole genome.

Here the varieties of plant have multiple of set of seven chromosomes like 14(2n),28(4n), 42(6n), 56 (8n)and 70(10n). This is a classic example of autopolyploids

Hence answer is C.