patterns of inheritance. what type of inheritance pattern is represented?
TRANSCRIPT
COMPLETE DOMINANCE
One allele is dominant over the other; therefore if an individual possesses one of each trait (heterozygous), then only the dominant trait is expressed.
The white allele is dominant; so
when a black cat & white cat
are crossed; all the offspring are
white
INCOMPLETE DOMINANCE
When two alleles are mixed and result in a third phenotype which is a blend of the two…incomplete dominance is expressed.
When a black cat and white cat are mated, gray offspring result.
Name the pattern of inheritance observed
A red bull is matedwith a white cow. Theresult is the roan cowpictured
CODOMINANCE
Since both red and white color is expressed in the offspring equally; neither allele is dominant over the other; they are both expressed equally
Multiple AllelesBlood types are determined by 3 alleles: A, B, O
However, an individual can have only TWO alleles at any one time.
Blood types also show dominance (A is dominant over O; B is dominant over O)
Blood types also show codominance (A and B are both expressed if paired together
POLYGENESSome traits are inherited by many pairs of genes. These traits result in many variations (eye color, skin color, hair color, height)
With these traits, the
majority of individuals
would fall in the middle
range.
Name the pattern of inheritance
A red eye fly is mated with a white eye fly. All the offspring have red eyes. But when two of these red flies are mated; there are 3 times as many red eye flies as white eye flies
HOWEVER: all the white eye flies are males
SEX-LINKEDMales only carry one allele for a sex-linked trait since the allele is only on the X chromosome.