Question

Species I has 2n=14 and species II has 2n=20. Give all possible chromosome numbers that may be found in the following individuals

a. An allotriploid formed from species I and species II

b. An allotetraploid formed from species I and species II

Answer 1

Answer =

Given are :

Species I has 2n = 14 and species II has 2n = 20.the possible numbers that may be found in the following individuals as follows:

a. An allotriploid formed from species I and species II

allotriploid means individual contains 3 sets of chromosomes.

there are two possibilities :

1. There will be n number of chromosome from species I & 2n number of chromosomes from species II.

species I has 2n = 14

n = 7

species II has 2n = 20

allotriploid has = n + 2n

   = 7 + 20 = 27

Therefore chromosome numebr of allotriploid individual = 27 X 2 =54

An allotriploid formed from species I and species II has 54 chromosomes.

2.There will be 2n number of chromosome from species I & n number of chromosomes from species II.

species I has 2n = 14

species II has 2n = 20

n = 10

allotriploid has = 2n + n

   = 14 + 10 = 24

Therefore chromosome numebr of allotriploid individual = 24 X 2 = 48

An allotriploid formed from species I and species II has 48 chromosomes

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b. An allotetraploid formed from species I and species II

allotetraploid means individual having 4 set of chromosomes.

species I has 2n = 14

species II has 2n = 20

allotetraploid has = 2n +2 n

   = 14 + 20 = 34

Therefore chromosome numebr of allotriploid individual = 34 X 2 = 68

An allotetraploid formed from species I and species II has 68 chromosomes.