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If both parents have freckles but one of their children do not have freckles (ff). What are the geno types of the parents?

Use the punnet square to help you.

so since the child doesn't have freckles the geno type of the parents must be mother Ff and father Ff

F f
F FF Ff

f Ff ff
Is this correct?
Thank you for checking my work

You're right about the Ff and Ff. Basically the genotypes should be FF, Ff, Ff, and ff.

thank you

Yes, your work is correct. If both parents have freckles (FF) and one of their children does not have freckles (ff), then the genotypes of the parents must be Ff. Your Punnett square correctly illustrates the possible combinations of alleles for the parents, showing that there is a 25% chance of their child inheriting the ff genotype and not having freckles. Well done!