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Genetics Vocab
Genetics Vocab
17
Science
7th Grade
03/19/2018

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Term
Gene
Definition
unit that passes on and determines traits.
Term
Allele
Definition
different forms of a gene
Term
Trait
Definition
unique characteristics
Term
Dominant
Definition
A gene or allele that is “shown” in the offspring. Dominant genes mask or "hide" recessive genes. “ Dominance Rules” uses capital “ R”
Term
Recessive
Definition
gene that is not “shown” in the offspring. Non ruling genes uses lower case “r”
Term
Heredity
Definition
the passing on of traits from parent to offspring
Term
Homozygous
Definition
having two of the same alleles for a trait. Example ( RR or rr)
Term
Heterozygous
Definition
having two different alleles for a trait. ( Aa)
Term
Phenotype
Definition
the physical characteristics in an organism ( like blue eyes, brown hair, blond hair)
Term
Genotype
Definition
the allele make-up such as TT, Tt,tt. Made of 2 alleles, represented by letters
Term
Punnett Square
Definition
a tool used to show all possible genetic outcomes of traits for offspring from one pair of parents
Term
Purebred
Definition
also known as HOMOZYGOUS. Consists of gene pairs that are the SAME
Term
Hybrid
Definition
Also called HETEROZYGOUS. Consists of gene pairs that are DIFFERENT
Term
Dominance
Definition
A gene or allele that is “shown” in the offspring. Dominant genes mask or "hide" recessive genes. “ Dominance Rules” uses capital “ R”
Term
Incomplete dominance
Definition
when no allele in a genotype is masked
Term
Codominance
Definition
when both inherited alleles are expressed
Term
Chromosome
Definition
a structure in the nucleus that contains hereditary material (DNA)
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