Question

EXERCISE 5 MENDELIAN TRAITS IN HUMANS 1 While most human traits are polygenic, the traits in the chart below have traditionally been considered Mendelian traits. More recent research has disputed the single-gene nature of some of these traits, but for the purpose of this exercise, assume that the following traits are Mendelian. Work with a partner to help each other determine your own phenotypes and possible genotypes for these traits. Write your answers in the chart. (Note: Refer to the table on p. 62 for information about these traits.) Mendelian Trait Your Phenotype Your Possible Genotype(s) Cleft Chin (Dominant) Freckles (Dominant) Attached Earlobes (Recessive) Hitchhiker's Thumb (Recessive) Widow's Peak (Dominant)

Answer 1

Alfreler Mendelian trait ! Your possible Your Phenotype genotypes Cleft chin (dominant) Have cleft chin (dominant) | cc or Cc No cleft chin (recessive) I cc Freckles (dominant) Have freckles (dominant) FF of ff No freckles (recessive) ff Attached earlobes free (dominant) EE or Ee I recessive) Attached (recessive) ee Hitchhiker's Thumb Don't have hitchhiker's thumb HH orth recessive) (dominant) Have hitchhiker's thumb | I hh crecessive) Widow's peak Have widow's peak (dominant) ww or wro Idominant) No widow's peak (recessive) | ww I have provided the possible phenotypes and their genotypes. You can write according to your phenotypes for example, if you have cleft chim, which is a dominant character, then your genotype will be cc or Cc; and if you don't have cleft chin, which is a recessive characfer, then you genotype will be cc. Similarly, you can write other trails.

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