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chapter test
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23
Biology
11th Grade
01/23/2012

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Term
gene
Definition
recipe for a specific protein.
Term
genetics
Definition
the study of gene structure and functions and their transmission between generations.
Term
p1
Definition
original mating pair(parents)
Term
f1
Definition
offspring of the parent generation.
Term
f2
Definition
offspring of the f1 generation.
Term
allele
Definition
versions off a gene, they cause different traits.
Term
dominant allele
Definition
the favored or stronger allele represented by a capitol letter(T=tall)
Term
recessive allele
Definition
the weaker allele represented by a lowercase letter. (t=short)
Term
homozygous
Definition
when the chromosomes have the same allele.
Term
heterozygous
Definition
when the two chromosomes have to different alleles.
Term
punnett squares
Definition
used to represent the cross of two parents and to show the possible outcomes in the offspring based on the alleles of the two parents.
Term
geneotype
Definition
types of alleles the organism has for those genes.
Term
phynotype
Definition
the physical trait of an organism.
Term
autosomal dominant trait
Definition
inheritance pattern of a dominant allele on an autosome ( a non sex determining chromosome) does not skip generations. but phenotype can affect males and females.
Term
autosomal recessive trait
Definition
inheritance pattern of a recessive allele on an autosome. the phenotype can affect males and females and can skip a generation.
Term
lethal alleles
Definition
cause death before the individual can pass on the trait to progeny.
Term
incomplete dominance
Definition
the heterozygotes have a phenotype that is in between that of either homozygote.
Term
multiple alleles
Definition
traits which have many allele types and many phenotypes
Term
codominance
Definition
when both alleles are equally dominant.
Term
epestasis
Definition
one gene affects the expression of another gene.
Term
plietropy
Definition
a single gene os responsible for a variety of traits.
Term
completely penetrant
Definition
everyone who inherits the combination of disease causing alleles has symptoms
Term
incompletely penetrant
Definition
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