LAB 03 EXERCISE 03

What is the likelihood of their daughter Maria having each of the possible phenotypes?

Because there is a 25% chance that Maria will be homozygous dominant and a 50% chance that she will be heterozygous for trait R, there is a 75% chance that she will display the dominant phenotype, the ability to roll the tongue. And because there is a 25% chance that she will be homozygous recessive, there is also a 25% chance that she will display the recessive phenotype, the inability to roll the tongue.

No matter what, Maria will be able to roll her tongue.

False

What is the likelihood of their daughter Maria having each of the possible genotypes?

From the Punnett square, you can see that there is a 25% chance that Maria will be homozygous dominant for trait R, a 50% chance that she will be heterozygous, and a 25% chance that she will be homozygous recessive.

Are you 100% sure of Maria's genotype?

No, there are 3 different possible genotypes

What is the father's phenotype?

The father is able to roll the tongue because the allele for the ability to roll the tongue is dominant over the allele for the inability to roll the tongue.

What is the father's genotype?

The father is heterozygous (Rr) for the tongue-rolling trait.

What is the mother's phenotype?

The mother is able to roll the tongue because the allele for the ability to roll the tongue is dominant over the allele for the inability to roll the tongue.

The Punnett square on p. 70 of your lab manual shows the genotypes of two parents for trait R. Use this Punnett square to answer the questions in this exercise. Trait R is the Mendelian trait in humans for tongue rolling. The allele for the ability to roll the tongue (R) is dominant over the allele for the inability to roll the tongue (r).What is the mother's genotype?

The mother is heterozygous (Rr) for the tongue-rolling trait.