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List 9

trait the genetic make up of an organism
gamete a characteristic that can pass on to its offspring
homozygous organisms with two identical alleles for a particular trait
heterozygous an organism that has two different alleles for a trait (hybrid)
punnett square A tool that describes all the possible combinations of alleles that can results from a genetic cross.
polygenic trait governed by two or more genes. (Most traits i.e. skin and eye color)
crossing over The physical exchange leading to an intermediate phenotype
nondisjunction failure of the chromosomes to separate during anaphase of meiosis
phenotype physical characteristics of an organism, regardless of its genes
genotype the different forms of a gene; representation of genes by letters
sex linked trait Genes carried on the X chromosome.
dominant an allele whose trait always shows up
recessive trait that is masked when a dominant allele is present
diploid full set of chromosomes EX. 46
random assortment chromosomes are sorted into daughter cells randomly
fertilization union of egg and sperm to form a zygote
incomplete dominance occurs when the phenotype of the offspring is somewhere in between the phenotypes of both parents, genes are expressed equally in a heterozygous
co-dominant allele both alleles are expressed in heterozygous individuals
pedigree Family tree showing inheritance of traits
carrier A person who has one recessive allele but does not have the trait
haploid a cell with only one copy of each chromosome, half EX 23
genetic variation variations of genomes among individuals in a population.
allele the different forms of a gene
Created by: chulin



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