8 Questions
What is the difference between genotype and phenotype?
Genotype is the genetic makeup of an organism, phenotype is what traits are expressed
What is the difference between genotype and phenotype?
Genotype is the genetic makeup of an organism, phenotype is what traits are expressed
How many genes are on the human X chromosome?
1,500
How many genes are on the Y chromosome?
231
Which is true about autosomal dominant traits?
They occur every generation and require one copy of the allele to express the trait
What is the sex determining gene for male development?
The Y chromosome
In order to express an autosomal recessive trait, how many copies of the gene are necessary?
Two
Which of the following is true about dominant alleles?
They use capital letters
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.
Test your knowledge on genetics and inheritance principles, including dominant and recessive alleles, genotype, phenotype, autosomal traits, and sex chromosomes. Explore how genes influence traits and the role of environment in phenotype expression.
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