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Questions and Answers
What is the definition of a dominant gene?
What is the definition of a dominant gene?
- The weaker gene; represented by a lower case letter
- The stronger gene; represented by a capital letter (correct)
- Has two of the same genes (DD or dd)
- Receive half of their genes from each parent
What is a recessive gene?
What is a recessive gene?
The weaker gene; represented by a lower case letter
What is a hybrid?
What is a hybrid?
Has two different genes (Aa)
What is a purebred?
What is a purebred?
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Organisms receive all of their genes from one parent.
Organisms receive all of their genes from one parent.
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What is a genotype?
What is a genotype?
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What is a phenotype?
What is a phenotype?
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What is a Punnett Square?
What is a Punnett Square?
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Study Notes
Genetics Vocabulary
- Dominant: Represents the stronger gene, usually denoted by a capital letter, exerting influence over its counterpart.
- Recessive Gene: Considered the weaker gene, represented by a lowercase letter, only expressed when both alleles are recessive.
Genetic Compositions
- Hybrid: An organism with two different alleles (e.g., Aa), combining traits from both dominant and recessive genes.
- Purebred: An organism with identical alleles (e.g., DD or dd), ensuring uniform traits across generations.
Gene Inheritance
- Organisms receive genetic material equally from both parents, with half of the genetic contribution coming from the mother and half from the father.
Genetics Terminology
- Genotype: Describes the genetic makeup of an organism, represented by combinations of letters that indicate alleles (e.g., AA, Aa, or aa).
- Phenotype: Refers to the observable physical characteristics or traits of an organism, such as eye color or height, resulting from the genotype.
Genetic Tools
- Punnett Square: A diagram used to predict the possible genetic combinations and outcomes of a cross between two organisms, illustrating the probabilities for genotypes and phenotypes.
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