A newly discovered species of dung beetle has 2n = 16 chromosomes. It mates with a closely related beetle species that has 2n = 12 chromosomes. How many chromosomes would there be in an amphidiploid beetle produced from this cross?

Option 3, 20 or 22

Explanation:

A newly discovered species of dung beetle has 2n = 16 chromosomes. It mates with a closely related beetle species that has 2n = 12 chromosomes. How many chromosomes would there be in an allotriploid beetle produced from this cross?  

Solution

An allotriploid is a species which contains  three sets of chromosomes of different species .Crossing can result in triploid offspring with diploid gamete of one species and regular haploid gamete of other offspring  

Case I - Resulting offspring (3n) = Gamete I (2n) + Gamete II (n)  

OR

Case II - Resulting offspring (3n) = Gamete II (2n) + Gamete I (n)  

Case I  

Case II

Hence, option 3 is correct

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