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Genetics Vocabulary
N/A
14
Biology
12th Grade
01/31/2013

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Term
Sex-Linked Gene
Definition
Is located on a sex chromosome.
Term
Phenotype
Definition
This is the physical description of the trait expressed.
Term
Genotype
Definition
This is genetic makeup, inherited from sperm and ovum cells.
Term
Di-Hybrid Cross
Definition
This is a chart that shows probability of more than one trait inherited.
Term
Incomplete Dominance
Definition
This is when a phenotype is a blend and the dominate trait may not truly show.
Term
Allele
Definition
An alternative version of a gene.
Term
Dominate Allele
Definition
This allele determines the phenotype of the trait, it is most often expressed in a species.
Term
Recessive Allele
Definition
This allele is not noticeable or occurs less often. This allele is masked or covered by the dominant allele.
Term
Co-Dominant
Definition
The inheritance pattern that has two different dominant factors present,the heterozygous expresses the distinct of both alleles.
Example: AB
Term
Homozygous
Definition
Two identical alleles making a combination or genotype.
Example: AA
Term
Heterozygous
Definition
When the allele combination is different, there is one dominant and one recessive present.
Example: Hh
Term
Law of Independent
Definition
The law that explains how alleles separate independently and randomly move into the newly created sperm or ovum cell.
Term
Law of Segregation
Definition
Mendel's 1st law of inheritance that explains how the genes show a random pattern in forming meiosis cells and why we inherit some dominant traits and some recessive traits randomly. It is not an all or nothing, we may have blue eyes (recessive) and brown hair (dominant).
Term
Pedigree
Definition
A family tree representing the occurrence of heritable traits in parents and offspring across a number of generations.
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