What would be an appropriate key for these traits

The correct answer is -

TT - short    BB - blue eyes

Tt - short tail  Bb - blue eyes

tt - no tail bb - brown eyes

Explanation:

In this given question it is stated that short tails of ribbits are dominant over the no tail trait of the rabbits and similarly blue eyes trait of the rabbits is also dominant over the brown-eye trait.

A dominant trait is represented by a capital letter and a recessive trait is represented by the small letter so for the tails alleles will be denoted as T and t, and for the eyes, the alleles would be B for blue and b for brown.

The key for these traits would be-

TT - short    BB - blue eyes, due to both dominant allele,

Tt - short tail  Bb - blue eyes, due to dominant allele masks the recessive allele

tt - no tail bb - brown eyes, due to both alleles are recessive

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