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Heredity - Genetics
Chapter 6, sections 1 (pgs. 156 - 162) and 2 (pgs. 164 - 170)
14
Science
7th Grade
11/12/2010

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Term
Heredity
Definition
the passing of traits from parent to offspring
Term
allele
Definition
different forms of a trait contained in a gene
Term
genetics
Definition
the study of how traits are inherited through the interactions of alleles
Term
hybrid
Definition
an offspring that was given different genetic information for a trait from each parent
Term
dominant
Definition
describes a trait that covers over, or dominates, another from of that trait
Term
recessive
Definition
describes a trait that is covered over, or dominated, by another form of that trait and seems to disappear.
Term
Punnett Square
Definition
a handy tool used to predict results in Mendelian genetics
Term
genotype
Definition
letters that form a code, or genetic makeup, of an organism
Term
phenotype
Definition
the way an organism looks and behaves as a result of its genotype
Term
homozygous
Definition
an organism with two alleles that are the same
Term
heterozygous
Definition
an organism that has two different alleles for a trait
Term
incomplete dominance
Definition
when the offspring of two homozygous parents show an intermediate phenotype
Term
polygenic inheritance
Definition

occurs when a group of gene pairs acts together to produce a trait

 

example: different shades of eye color

Term
sex-linked gene
Definition

an allele inherited on a sex chromosome

 

example: color blindness

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