Question

A research lab requires a supply of purebreeding freckled frogs (FF) for a cloning experiment. A lab assistant has a pet frog with freckles but it is uncertain if it is homozygous or heterozygous. The pet frog is crossed with a homozygous recessive (non-freckled) frog (ff). Half of the offspring are freckled frogs and half are smooth. Use a punnett square to support your answer.

Answer 1

It would have to be heterozygous.
If you crossed the non-freckled frog (ff) by:
A homozygous freckled frog, the cross is FF x ff, and all offspring would be Ff, the phenotype of all offspring would be freckled, since each will possess the dominant. F, allele.
A heterozygous freckled frog, the cross is Ff x ff, and half the offspring would be Ff (freckled heterozygous), the other half would be ff, non-freckled homozygous.

That is the answer and reasoning, try making the Punnett square to support this. It is just a monohybrid square, give it a shot.

Answer 2

Thank you