Question

Lab Exercises 71 EXERCISE 4 INTERPRETING PEDIGREE DIAGRAMS Work in a small group or alone to complete this exercise using the pedigree diagram below for tra Rin a family Trait R is the Mendelian trait in humans for tongue rolling The allele for the ability to roll the tongue IR) is dominant over the allele for the inability to roll the tongue Complete the following chart using the pedigree diagram Person Genotype Phenotype 1. Are you 100% sure of each person's phenotype? If not, which ones are problematic? Why? 2. Are you 100% sure of each person's genotype? If not, which ones are problematic? Why?

biological Anthropology

thanks in advance

Answer 1

To be 100% sure of the phenotype, we can make a Punnett Square with each parent. IN the case of genotypes, we can be sure about the recessive homozygous (Inability to roll) but with the tongue rolling individuals, the genotype could be Rr or RR (in some cases)

RR X Rr R. R R RR | Rr RR Rr Rr RR (Tongue rolling) (Tongue rolling) Rr x rr R | Rr [rr Rrrr RR Rr RR (Tongue rolling) (Tongue rolling) (Tongue rolling) Inability to roll Rr (Tongue rolling) Inability to roll Inability to roll Inability to roll rr Inability to roll Inability to roll Inability to roll