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Genetics- Bozemanbiology- Paige T
Chapter 9- Patterns of Inheritance
31
Biology
10th Grade
04/12/2012

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Term
Character
Definition
-a heritable feature that varies among individuals within a population, such as flower color in a pea plant
Term
Trait
Definition
- a varient of a character found within a population, such as purple flowers in pea plants
Term
Self-fertilize
Definition
- the fusion of sperm and egg by the same individual organism, as in a pea plant
Term
Cross- fertilization
Definition
- the fusion of sperm and egg derived from two different individuals
Term
Hybrid
Definition
- the offspring of parents of two different species or of two different varieties of one species
Term
Cross
Definition
- a mating of two sexually reproducing individuals; often used to describe a genetics experiment involving a controlled mating
Term
True- breeding
Definition
- referring to organisms for which sexual reproduction produces offspring with inherited traits identical to those of the parents; homozygous for a trait being considered
Term
P generation
Definition
- the parent individuals from which offspring are derived in studies of inheritance (P= parental)
Term
F1 generation
Definition
- the offspring of two parental (P generation) individuals (F1= first filial)
Term
F2 generation
Definition
- the offspring of the F1 generation (F2= second filial)
Term
Monohybrid cross
Definition
- an experimental mating of individuals differing at one genetic locus
Term
Allele
Definition
- an alternative version of a gene
Term
Homozygous
Definition
- having two identical alleles for a given gene
Term
Heterozygous
Definition
- having two different alleles for a given gene
Term
Dominant allele
Definition
- the allele that determines the phenotype of a gene when the individual is heterozygous for that gene
Term
Recessive allele
Definition
- an allele that has no noticeable effect on the phenotype of a gene when the individual is heterozygous for that gene
Term
Law of Segregation
Definition
- a general rule in inheritance that individuals have two alleles for each gene and that when gametes form during meiosis, the alleles seperate, each resulting gamete ending up with only one allele of each gene
Term
Phenotype
Definition
- the expressed traits of an organism
Term
Genotype
Definition
- the genetic makeup of an organism
Term
Dihybrid cross
Definition
- an experimental mating of individuals differing at two genetic loci
Term
Law of Independent Assortment
Definition
- a general rule in inheritance that when gametes form during meiosis, each pair of alleles for a particular characteristic segregate independently of other pairs
Term
Testcross
Definition
- the mating between an individual of unknown genotype for a particular characteristic and an individual that is homozygous recessive for that same characterisitic
Term
Carrier
Definition
- an individual who is heterozygous for a recessively inherited disorder and who therefore does not show symptoms of that disorder but who may pass on the recessive allele to offspring
Term
Complete dominance
Definition
- a type of inheritance in which the phenotypes of the heterozygote and dominant homozygote are indistinguishable
Term
Incomplete dominance
Definition
- a type of inheritance in which the phenotype of a heterozygote (Aa) is intermediate between the phenotypes of the two types of homozygotes (AA and aa)
Term
Codominant
Definition
- inheritance pattern in which a heterozygote expresses the distinct trait of both alleles
Term
Pleiotropy
Definition
- the control of more than one phenotypic characteristic by a single gene
Term
Polygenic inheritance
Definition
- the additive effect of two or more gene loci on a single phenotypic characteristic
Term
Chromosome Theory of Inheritance
Definition
- a principle in biology stating that genes are located on chromosomes and that the behavior of chromosomes during meiosis accounts for inheritance patterns
Term
Linked genes
Definition
- genes located near each other on the same chromosome that tend to be inherited together
Term
Recombination frequency
Definition
- with respect to two given genes, the number of recombinant progeny from a mating divided by the total number of progeny
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