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Questions and Answers
What is the difference between genotype and phenotype?
What is the difference between genotype and phenotype?
- Genotype is the genetic makeup of an organism, phenotype is the environment
- Genotype is the genetic makeup of an organism, phenotype is what traits are expressed (correct)
- Genotype is the environment, phenotype is the genetic makeup of an organism
- Genotype is the expression of traits, phenotype is the genetic makeup of an organism
What is the difference between genotype and phenotype?
What is the difference between genotype and phenotype?
- Genotype is the genetic makeup of an organism, phenotype is the environment
- Genotype is the environment, phenotype is the genetic makeup of an organism
- Genotype is the genetic makeup of an organism, phenotype is what traits are expressed (correct)
- Genotype is the environment, phenotype is what traits are expressed
How many genes are on the human X chromosome?
How many genes are on the human X chromosome?
- 231
- 1,500 (correct)
- 500
- 2,000
How many genes are on the Y chromosome?
How many genes are on the Y chromosome?
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Which is true about autosomal dominant traits?
Which is true about autosomal dominant traits?
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What is the sex determining gene for male development?
What is the sex determining gene for male development?
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In order to express an autosomal recessive trait, how many copies of the gene are necessary?
In order to express an autosomal recessive trait, how many copies of the gene are necessary?
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Which of the following is true about dominant alleles?
Which of the following is true about dominant alleles?
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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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