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Biology Vocab Quiz 2/3/05 12.1,14

Terms

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Heredity
passing on of characteristics from parents to offspring
Genectics
branch of biology that studies heredity
traits
characteristics that are inherited
gametes
sex cells
fertilization
uniting of male and female gametes
pollination
the transer of the male pollen grains to the female organ of a flower
alleles
different gene formed
dominant
observed trait
recessive
trait that disappear
law of segregation
principal explaning the disappearance of specific trait, and is passed down
phenotype
the way an organism looks and behaves
genotype
gene combination an organism contains
homozygous
two alleles for traits are the same
heterozygous
two alleles for traits are different
dihyprid cross
a cross involving two different traits
law of independent assortment
genes for different traits
incomplete dominance
phenotype of heterosygot is intermediate between those of two homozygous
codominant alleles
cause the phenotypes of both homosygotes to be produced in heterosygote individuals
multiple alleles
traits controlled by more than two alleles
autosomes
22 pairs of matching homeologous chromosomes, cant be on the 23rd
sex chromosomes
two chromosomes that determine the sex of an individual
sex-linked traits
traits contolled by genes located on sex chromosomes
pologenic inheritance
the inheritance pattern of a trait that is controlled by two or more genes
testcross
a cross of an individual of unknown genotype with an individual of known genotype to determine the unknown genotype
carrier
heterozyous, one big one little, has the recessive trait
pedigree
a graphic representation of an individuals family tree, whcih premits patterns of ingeritance to be recongnized
inbredding
mating between closely related individuals
hybrids
two varieties of closely related speciesare crossed, their offspring

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