Punnett's Square
A frog with two dominant alleles of a certain gene is bred with a
hybrid
frog with one dominant and one recessive allele (of the same gene). What is the probability that the offspring will have a a purely dominant genotype?
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1 solution
According to the rules of the Punnett Square, the possible genotypes are (if D refers to dominant and d refers to recessive):
DD Dd DD Dd
when matching a frog of genotype "DD" with a "hybrid" frog of genotype "Dd". To get a "purely dominant genotype", you must get DD. Therefore 2/4 = 1/2.
Although, if I may make a quick suggestion-- I don't necessarily think "hybrid" is the word you're looking for there, Finn ;) That makes it seem like it's somewhat of a different species.. as in a mule vs. a donkey...