Visible Phenotypes in Humans

Visible Phenotypes in Humans
In this exercise, you will examine some traits possessed by you and your classmates. Notice as you proceed through the list that just
because a trait is common in a population does not necessarily mean that it is controlled by the dominant allele.
Procedure:
1. Read the descriptions of each trait and fill in your phenotype in the table below.
2. List your genotype in the table. For example, if you have the recessive trait for gene N, your genotype is homozygous
recessive nn. If you have the dominant trait for gene N, your genotype is not fully known, so fill in N_ on the chart. If you
know that one of your parents is recessive for that trait, you must have received a recessive allele (n) from him/her, so your
genotype is Nn.
3. Give your phenotype to your instructor so he/she can provide you with the phenotypic results for the class. Use the in the
chart to analyze phenotypic results for a group.
Widow’s peak The W allele for a widow’s peak (pointed hairline) is dominant to the 𝒘 allele for a straight hairline.
Bent little finger The B allele for a pointed little finger is dominant to the b allele for a straight little finger. You have the bent little finger if you lay your hand flat on the bench and the last joint of your little finger bends toward your fourth finger.
Pigmented iris The P allele produces pigment in the front layer of the iris, resulting in green, hazel, brown, or black eyes.
This is dominant to the 𝒑 allele, which does not produce pigment in the front layer, and results is blue or gray eyes (you are seeing the color of the back layer of iris).
Hitchhiker’s thumb The H allele for non-hitchhiker’s thumb is dominant to the h allele for the hitchhiker’s thumb (you can bend your thumb back at an angle of 60° or more at the last joint.
Interlacing fingers Fold your hands together with your fingers interlaced. If your left thumb crosses over the right, you have the dominant allele C. The 𝒄ത allele is recessive, with the right thumb crossing over the left.
Red Hair The G allele for any hair color other than red is dominant to the g allele for red hair.
Acondroplasia The D allele for acondroplasia, extremities disproportional (smaller) to body size, is
dominant to the d allele for average height and proportioned extremities.

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