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12 terms

Bio chapter 12

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Carrier
An indvidual heterozygous for a specific trait.
Fetus
A developing mammal from nine weeks to birth.
Pedigree
Graphic representation of genetic inheritance used by gentics to map genetic traits.
Autosome
Pairs of matching homologous chromosomes in somatic cells.
Codominant Alleles
Pattern where the phenotypes of both homozygote parents are produced in heterozygous offspring so that both alleles are equally expressed.
Incomplete Dominance
Inheritance pattern where the phenotype of a heterozygote is intermediate between those of the two homozygotes.
Multiple Alleles
Presence of more that two alleles for a genetic trait.
Polygenetic Inheritance
Inheritence pattern of a trait controlled by two or more genes.
Sex Chromosome
In humans, the 23rd pair of chromosomes.
Sex-linked Trait
Traits controlled by genes located on sex chromosomes.
Karyotype
Chart of metaphase chromosome pairs arranged according to length and location of the centromere.
Environmental Influences
temp, nutrition, light, chemicals influence gene expression.