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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?

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?

Human Biology (MindTap Course List)
Human Biology (MindTap Course List)
11th Edition
ISBN:9781305112100
Author:Cecie Starr, Beverly McMillan
Publisher:Cecie Starr, Beverly McMillan
Chapter19: Introduction To Genetics
Section: Chapter Questions
Problem 9CT
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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 the pair for the trait to be expressed). The genotype is homozygous. Trait domin allele in a pair for the trait t expressed). The genotype either Phenotype Cleft in the Chin This trait has been well documented. Absence of a cleft is dominant and may be either homozygous or heterozygous. The presence of a cleft is recessive and represents a homozygous condition. Trait Phenotype Hairline A slight dip in the center of the hairline is called a widow's peak. A widow's peak is dominant and may be either homozygous or heterozygous. A straight hairline is recessive and homozygous. Trait Phenotype Eyebrow Size Broad eyebrows are dominant and are either homozygous or heterozygous. Slender eyebrows are recessive and homozygous. Bushiness increases with age. Trait Phenotype © 2013 Dr. Brenda Schumpert
Transcribed Image Text: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 the pair for the trait to be expressed). The genotype is homozygous. Trait domin allele in a pair for the trait t expressed). The genotype either Phenotype Cleft in the Chin This trait has been well documented. Absence of a cleft is dominant and may be either homozygous or heterozygous. The presence of a cleft is recessive and represents a homozygous condition. Trait Phenotype Hairline A slight dip in the center of the hairline is called a widow's peak. A widow's peak is dominant and may be either homozygous or heterozygous. A straight hairline is recessive and homozygous. Trait Phenotype Eyebrow Size Broad eyebrows are dominant and are either homozygous or heterozygous. Slender eyebrows are recessive and homozygous. Bushiness increases with age. Trait Phenotype © 2013 Dr. Brenda Schumpert
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