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Inheritance pattern

Inheritance pattern NBCRHScaruso

QuestionAnswer
What is complete dominance? Example? When an individual is heterozygous; when an Ss individual always expresses the S phenotype.
What is incomplete dominance? When heterozygotes show a phenotype intermediate between those of the two homozygotes; neither of the 2 alleles is dominant. Alleles: RR-red rr-white Rr-pink
What is codominance? Example? When both phenotypes of the 2 alleles appear in heterozygotes. Example is ABO blood system in humans, when antibodies are mixed with blood and form unique results. Allele: Sickle cell anemia- S sickle shape N normal cells SN normal & sickle
What are multiple alleles? Example? When there are more than 2 alleles of a given gene, they increase the number of possible phenotypes. Coat color in rabbits is determined by one gene with 4 alleles.
What is pleiotropic? Example? When a single allele has more than one distinguishable phenotypic effect. One allele in siamese cats controls coloration pattern and characteristic crossed eyes.
Give example of incomplete dominance When white and red snapdragons are crossed, the F1 generation is pink. The trait appears blended, but in the F2 generation the white and red alleles reappear.
What is polygenic? Example? When a trait is determined by many genes, such as eye or skin color.
What is sex influenced? Example? The trait is determined by the sex of the organism. A male might be dominant for the same trait a woman is recessive for. Allele examples: D (dominant for male) and DI (recessive for female)
What is sex linked? Example? The alleles are attached to the male and female X chromosomes. Eye color in fruit flies is a sex linked trait; females are XX so have 2 alleles and males are XY so they have 1 allele.
Created by: decaruso
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