Apedia

OCR A Biology

Dominant Alleles Red Gene Flower White Homo Represented

Codominance is when two different dominant alleles for a gene are both expressed in the phenotype. An example is snapdragon flowers where alleles for red and white color are codominant, resulting in pink flowers (heterozygous) or red/white flowers (homozygous), with alleles represented using superscripts like C^R and C^W.

Codominance occurs when two dominant alleles for a gene are both expressed in the phenotype. For example, snapdragon flowers with alleles for red (C^R) and white (C^W) colors will be pink (heterozygous) if both alleles are present, showing both red and white, or red or white if homozygous. The alleles are denoted with a capital letter for the gene and superscripts for the specific allele.

Front Codominance
Back
  • occurs when 2 dominant alles occur for a gene that are equally dominant and so both alleles expressed as phenotype
  • e.g colour of snapdragon flower either red or white (alleles coding for these colours both dominant), so flower can be red (homo dominant red), white (homo dominant white) or pink (hetero)
  • the alleles are represented using a capital letter for the gene (e.g C here) and the alleles represented by second letter shown as superscript (e.g here its C^R for red and C^W for white)

Learn with these flashcards. Click next, previous, or up to navigate to more flashcards for this subject.

Next card: I^a i^b multiple alleles results prod i^o gene

Previous card: Homo state genetic hetero phenotype cross monogenic rules

Up to card list: OCR A Biology