Genetics Section 2 Flashcards
the laws of probability predict what _____ will occur, not what ____ occur
likely, will
give an ex of probability
tossing a coin
a chart that shows all the possible combinations of alleles that can result from a genetic cross. This also determines the probability of a particular outcome.
Punnett square
an organisms physical appearance (or traits) is called
phenotype
an organisms genetic makeup (alleles) is called
genotype
what term is used to describe an organisms whose genotype consists of 2 identical alleles (TT)?
Homozygous
what term is used to describe an organisms whose genotype consists of 2 different alleles (Tt)?
heterozygous
explain how 2 organisms can have the same phenotype but different genotypes?
2 organisms can show the trait of brown hair but one organism can have the alleles BB and the other organism can have the alleles of Bb. Genotype is BB and Bb and phenotype is brown hair.
When an offspring who’s alleles from both parents that is called (this means the genetics are not following Mendel’s work)
co-dominance
Give an ex of codominance
codominance is when an organism shows both the parents’ traits. A white hen can crossbreed with a black rooster. Each offspring can have colors black and white. The trait do not blend to make gray.
what is incomplete codominance?
when a trait blends in an offspring (white flower breeds with red flower and the offspring is pink)