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Genetics
Mendelian genetics
15
Biology
9th Grade
01/15/2013

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Term
traits
Definition
these are characteristics that we each have in our bodies. Each gene codes for this.
Term
alleles
Definition
the variation of a particular trait. they are the alternative forms of a gene. these can be called the flavor of the trait
Term
genes
Definition
A unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring
Term
genotype
Definition
the genetic make up of an organism.
Term
phenotype
Definition
the physical appearance of an organism.
Term
dominant
Definition
alleles that cover up the others. represents a capital letter.
Term
recessive
Definition
alleles that are covered by the dominant allele. represented by the lower case letter.
Term
homozygous
Definition
when two alleles are the same or identical for a gene.
Term
heterozygous
Definition
when two alleles are different for a gene.
Term
inheritance
Definition
the passing on of traits.
Term
heredity
Definition
traits from parents to offspring.
Term
Gregor Mendel
Definition
The father of genetics. a monk in austria who wasput in charge for running a garden. he studied statistics.  when studying pea plants, he had an idea that parents pass genes to their offspring. he controlled the matingof plants with certain traits that were the same or opposite. he cam out with plants thatwere pure for seven different traits. when he mated the plants with opposite traits that were siblings, he came out with a 3 to 1 ratio with the f2 generation with 3/4 short plants and 1/4 small plants.  
Term
principle of dominant and recessive alleles
Definition
one gene will mask or cover up the other. the dominant factor will cover the recessive.
Term
principle of segregation
Definition
allels are separated during meiosis and they are combined with another allele to make a dominant or recessive allele.
Term
principle of independent assortment
Definition
pairs of alleles are not connected and alleles are independent and notrelated to each other whatsoever.
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