Question

jordan:
genotype:
rr: can roll tongue →
rr: can roll tongue→
rr: cannot roll tongue →
phenotype:
rolling tongue:
not rolling tongue:
conclusion:
mary:

Explanation:

Step1: Determine genotypes

Mary has alleles \( R \) and \( R \), Jordan has alleles \( R \) and \( r \).

Step2: Fill Punnett square

• Top - left cell: \( R\times R = RR \)
• Top - right cell: \( R\times r = Rr \)
• Bottom - left cell: \( R\times R = RR \)
• Bottom - right cell: \( R\times r = Rr \)

Step3: Calculate phenotypes

• Genotypes \( RR \) and \( Rr \) (3 out of 4) show "rolling tongue" phenotype.
• Genotype \( rr \) (0 out of 4) shows "not rolling tongue" phenotype.

Answer:

Genotype: \( RR, Rr, RR, Rr \)
Phenotype: Rolling tongue: \( \frac{3}{4} \) (or 75%), Not rolling tongue: \( 0 \)
Conclusion: There is a 75% chance of offspring with tongue - rolling ability and 0% chance of non - tongue - rolling offspring.