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Creative Use Of Vocab, chapter 2
homework
17
Science
7th Grade
01/31/2012

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Term
heredity
Definition
The passing of traits from parent to offspring
Term
trait
Definition
A characteristic that an organism can pass on to its offspring through its genes
Term
genetics
Definition
The scientific study of heredity
Term
fertilization
Definition
The process in wich an egg cell and a sperm cell join to form a new organism
Term
purebred
Definition
The offspring of many generations that have the same traits
Term
gene
Definition
The set of information that controls a trat; a segment of DNA on a chrmosome that codes for a specific trait
Term
alleles
Definition
The different forms of a gene
Term
dominant allele
Definition
An allele whose trait always shows up in the organism when the allele is present
Term
recessive allele
Definition
An allele that is masked when a cominant allele is present
Term
hybrid
Definition
An organism that has two different alleles for a trait; an organism that is heterozygous for a specific trait
Term
probability
Definition
A number that describes how likely it is that an event will occur
Term
Punett square
Definition
A chart that shows all of the possible combinations of alleles that can result from a genetic cross
Term
phenotype
Definition
An organism's physical appearance or visible traits.
Term
genotype
Definition
An organisms genetic makeup, or allele combinations
Term
homozygous
Definition
Having two identical alleles for a trait
Term
heterozygous
Definition
Having two different alleles for a trait
Term
codominance
Definition
A condition in wich neither of two alleles of a gene is dominant or recessive
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