Dimpling in the cheek is controlled by a dominant allele while non-dimpling is recessive. Determine the phenotypes for both you and your partner.      What possible genotypes could produce these phenotypes? What genotypic and phenotypic ratios would you expect in your offspring?

Incomplete Dominance and Codominance So far, we have been studying the inheritance of genes that show complete dominance. In other words, one allele is completely dominant over another. In some cases, such as incomplete dominance and codominance, one allele is not completely dominant over another or the alleles affect the phenotype equally. Examples of incomplete dominance include feather color in parrots (C*C* = blue, C'C = yellow, C*Cf = green) and hair texture in humans CC = curly; C'C' = straight; CC' = wavy Practice Problem 3: За. If a straight-haired man marries a curly haired woman, what are the predicted genotypes and phenotypes of their children? If a parrot with yellow feathers is crossed with a parrot with green feathers, what are the predicted genotypes and phenotypes of their offspring? 3b.

A1) The allele for widows peak (H) is dominant for the allele for no widows peak (h). At a different gene locus, the allele for hitchhikers thumb (D) is dominant to the allele for non-hitchhikers thumb (d). A man is heterozygoous for the traits and marries a woman who has no widows peak and is heterozygous for hitchhikers thumb. What fraction of this couples children should have a widow's peak and a hitchhiker's thumb? 3/8 1/4 1/2 3/4 0 A2)The allele for widows peak (H) is dominant for the allele for no widows peak (h). At a different gene locus, the allele for hitchhikers thumb (D) is dominant to the allele for non-hitchhikers thumb (d). A man is heterozygoous for the traits and marries a woman who has no widows peak and has no hitchhikers thumb. What fraction of this couple's children should have no widow's peak and a hitchhiker's thumb? 3/8 0 1/4 1/2 1/8

Name: Human Phenotypes Simple dominance inheritance pattern: Q: How many phenotypes are evident in patterns of simple dominance? What are they? If a phenotype results from simple dominance, which two genotypes cannot be distinguished? Which phenotype is always representative of the genotype? Now determine your personal inheritance of the following traits. As you read through the following descriptions, you'll identify your trait, and determine your phenotype. Your trait will be one of the two Shape of the face. Most facial characteristics are affected by many different genes acting together (multiple factors or polygenic inheritance). For this trait we have simplified the nature of this trait by assuming it is the result of a single gene. Oval shape is dominant (needs only homozygous (both alleles are the same, either dominant or recessive) or heterozygous (one dominant allele and one recessive allele). Square shape is recessive (requires that both alleles are the recessive allele in…

If a B is a dominant allele that codes for a trait where the bearer of this allele has a black coat, and b is a recessive allele where the bearer has a brown coat, the recessive genotype will exhibit the phenotype of brown coat, the genotype will have the black coat phenotype, and the dominant genotype will have the black coat phenotype. (Use either heterozygous or homozygous in the blanks.)