In humans, being a tongue roller (R) is dominant over non-roller (1). A man who is a non-roller marries a woman who is heterozygous for tongue rolling.

This question is incomplete, the complete part of the question is as follows:

1. Father’s phenotype _______ Father’s genotype ______

2. Mother’s phenotype ________ Mother’s genotype _______

3. What is the probability of this couple having a child who is a tongue roller?

- Father's phenotype is NON-ROLLER, while his genotype is rr.

- Mother's phenotype is ROLLER while her genotype is Rr

- The probability of this couple having a child who is a tongue roller is 50% or 1/2.

Explanation:

This question involves a single gene coding for the ability or not to roll the to tongue in humans. The alelle for tongue roller (R) is dominant over the allele for non-roller (r). This means an heterozygote individual (Rr) will be able a tongue roller.

According to this question, a man who is a non-roller (rr) marries a woman who is heterozygous for tongue rolling (Rr) i.e. rr × Rr. The following gametes will be produced by each parent:

rr - r and r

Rr - R and r

Using these gametes in a punnet square (see attached image), the following proportion of offsprings will be produced:

Rr, Rr, rr and rr

- Offsprings with genotype Rr (1/2 or 50%) will be tongue rollers

- Offsprings with genotype rr (1/2 or 50%) will be non-tongue rollers.

Hence, based on this question;

- Father's phenotype is NON-ROLLER, while his genotype is rr.

- Mother's phenotype is ROLLER while her genotype is Rr

- The probability of this couple having a child who is a tongue roller is 50% or 1/2

identify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.identify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.v