Podcast
Questions and Answers
What is the difference between a genotype and a phenotype?
What is the difference between a genotype and a phenotype?
How many protein-encoding genes are on the Y chromosome?
How many protein-encoding genes are on the Y chromosome?
What is the sex determining gene for male development?
What is the sex determining gene for male development?
What is necessary for an autosomal dominant trait to be expressed?
What is necessary for an autosomal dominant trait to be expressed?
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What letter is used to represent dominant alleles?
What letter is used to represent dominant alleles?
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How many genes are on the X chromosome?
How many genes are on the X chromosome?
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What is required for an autosomal recessive trait to be expressed?
What is required for an autosomal recessive trait to be expressed?
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How often do autosomal dominant traits occur?
How often do autosomal dominant traits occur?
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Study Notes
- Dominant alleles use capital letters, recessive alleles use lowercase letters
- Genotype is the genetic makeup of an organism (alleles), phenotype is what traits are expressed
- Autosomal dominant traits occur every generation, you only need one copy of the allele to express the trait
- Autosomal recessive traits can skip generations, two copies of the gene are necessary to express the trait
- Phenotype is influenced by many genes, but is also affected by the environment
- The human X chromosome has more than 1,500 genes, while the Y chromosome has only 231 protein-encoding genes
- The sex determining gene for male development is on the Y chromosome.
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Description
Learn about dominant and recessive alleles, genotype, phenotype, and inheritance patterns of autosomal dominant and recessive traits. Understand how genes and the environment influence an organism's phenotype, and the differences between the X and Y chromosomes in humans.
