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science C test

science griffin

chromosomes a doubled rod of condensed chromatin that contain DNA and genetic information
codominance a condition in which neither of two alleles of a gene is dominant or recessive
hybrid an organism that has two different alleles for a trait also called heterozygous
traits a characteristic that an organism can pass onto its offspring through its genes or is inherited
meiosis the process that occurs in sex cells by which the number of chromosomes is reduced by half
multiple allele three or more forms of a gene that codes a single trait
phenotype an organism's physical appearances or visible traits
allele the different forms of a gene
carrier a person who has one recesive allele for a trait and one dominant allele, but doesn't have the trait
dominant an allele whose trait always shows up in the organism when the allele is present
genotype an organisms genetic makeup or allele combination
heredity the passing of traits from parents to offspring
heterozygous having two different alleles for the same trait
pedigree a chart or "family tree" that tracks which members of a family have a particular trait
probability the likelihood that a particular event will occur
Punnett Square a chart that shows all the possible combinations of alleles that can result from a genetic cross or the possible genetic combinations of parents compared to their offspring
recessive an alllele that is masked when a dominant allele is present--- the weaker gene that is hidden when a dominant gene is present
purebred an organism that always produces offspring with the same form of a trait as the parent
sex linked genes a gene that is carried on the X and Y chromosome
sex linked traits a trait that is carried on the X and Y chromosome
Describe the difference of genotype and phenotype. genotype is an organisms genetic makeup and phenotype is an organisms physical traits.
How does masking occur? Dominant allele masks the recessive allele.
What is codominance and give a descriptive example of a codominant trait. codominance- the alleles are neither dominant nor recessive. As a result, neither allele is masked or hidden in offspring. example, In Erminette chickens, the alleles for black and white feathers are codominate.
Created by: lmajor