Species 1 is described as 2n = 8 and has chromosome composition BBDDEEHH. Specie

Question

Species 1 is described as 2n = 8 and has chromosome composition BBDDEEHH.

Species 2 is described as 2n = 10 and has chromosome composition NNPPSSXXZZ.

Select the best answer to classify the organism below based on its chromosome composition. Note that each letter represents a chromosome and that the organism below is either an individual from one of the species above or is derived from one or both species above.

Organism:   BBDDEEHHNPSXZ

a. Haploid

b. Double Trisomic

c. Autotetraploid

d. Double Monosomic

e. Monosomic

f. Nullisomic

g. Diploid

h. Allotetraploid

i. Allotriploid

j. Trisomic

k. Autotriploid

Explanation / Answer

Polyploidy:

Polyploidy is the condition in which the organism has more than 2 complete set of chromosome. Polyploidy is rare in animals, but can be seen common in plants.

Polyploidy can be induced experimentally in animals such as frog and rabbits.

Natural autopolyploidy: this occurs naturally by genome doubling. For example in potato plants.

Artificial autopolyploidy: in this type the polyploidy can be introduced be some chemicals like colchicine.

These are caused by chromosomes from different species. Example: triticale, it has 6 chromosome sets – 4 from wheat and 2 from rye.

Types of polyploidy:

Triploidy: 3n – has extra haploid set of chromosome.

Tetraploidy: 4n – has 1 extra diploid set of chromosome.

Answer:

i. Allotriploid

2n = 8 Species I: BBDDEEHH

2n = 10 Species II: NNPPSSXXZZ

Organism: BBDDEEHHNPSXZ

The organism has 2n = 8 from species I + 1n = 5 from species II, which forms 3n from 2 different species so it is allotriploid.

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