What is the probability of offspring inheriting tongue rolling gene?

Tongue rolling is a dominant genetic trait, which means that if an individual has at least one copy of the dominant allele, they will express the trait. Let's consider the following scenarios:

Parents are both tongue rollers (genotype: RR):

- In this case, all offspring will receive the dominant allele from both parents, and will therefore be tongue rollers. The probability of offspring inheriting the tongue rolling gene is 100% (or 1.0).

Both parents are non-tongue rollers (genotype: rr):

- In this case, neither parent can pass on the dominant allele, and all offspring will be non-tongue rollers. The probability of offspring inheriting the tongue rolling gene is 0% (or 0.0).

One parent is a tongue roller (genotype: Rr) and the other is a non-tongue roller (genotype: rr):

- In this case, the offspring have a 50% chance of inheriting the dominant allele from the tongue-rolling parent. Half of the offspring will be tongue rollers, and the other half will be non-tongue rollers. The probability of offspring inheriting the tongue rolling gene is 50% (or 0.5).

Therefore, the probability of offspring inheriting the tongue rolling gene depends on the genotypes of the parents. If one or both parents are tongue rollers, the offspring have a higher chance of inheriting the gene.