Unit 5 Science
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when the heterozygote phenotype is a combination of the homozygous phenotypes
incomplete dominance
different forms of a gene
allele
a section on a chromosome that has genetic information for 1 trait.
gene
threadlike structures that contain genetic information in the form of a gene.
chromosome
when both alleles are expressed.
co dominance
how is the incomplete and co dominance phenotypic ratio set up?
Dom:hetero:homorec
a genetic factor that blocks another factor
dominant
the offspring of 2 true breeding plants with different forms of the same trait.
hybrid
negative traits that result from inheriting a sex-linked gene
sex linked disorders
a gene on a sex chromosome
sex-linked gene
these determine the gender of an individual and carry sex-linked characteristics.
sex chromosome
what is the male sex chromosome?
xy
what is the female sex chromosome?
xx
what is a human example for a result of polygenic inheritance?
• eye color • skin color • hair color • weight
when more than 2 alleles control 1 trait in a population
multiple alleles
when multiple genes determine the phenotype of a trait.
polygenic inheritance.
a model used to predict possible genotypes and phenotypes of offsprings if parental genotypes are known
punnet square
fill in the blank: when organisms reproduce each reproductive cell contributes _______ factor(s) for each trait
1
pollen from one plant reaches the pistil of a flower on a different plant.
cross pollination
how a trait appears or is exposed
phenotypes
a plant that always produces offspring with the same trait when it is self pollinated
true breeding plant
how is the simple dominance phenotypic ratio set up?
Dom:rec
the likelihood that a specific event will occur
probability
when the 2 alleles of a gene are the same
homozygous