1 / 8

Understanding Incomplete Dominance and Codominance in Heredity

This bellringer explores different patterns of heredity, focusing on incomplete dominance, codominance, multiple alleles, and sex-linked inheritance. In incomplete dominance, the heterozygote phenotype is a blend of the two homozygote phenotypes, exemplified by red (RR), white (rr), and pink (Rr) flowers. Codominance displays both homozygote traits in heterozygotes, as seen in checkered chickens. The concept of multiple alleles is illustrated through rabbit coat color and human blood types, including the significance of sex-linked traits like colorblindness and hemophilia.

raymond-kemp
Télécharger la présentation

Understanding Incomplete Dominance and Codominance in Heredity

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Bellringer (Week 3)

  2. Bellringer cont.

  3. Section 12-2 When Heredity Follows Different Rules

  4. Incomplete Dominance • The phenotype of the heterozygote is in between the two homozygotes. • RR – Red flowers • rr – white flowers • Rr – pink flowers

  5. Codominance • Causes the phenotype of both homozygotes to be produced in heterozygous individuals. • Ex: Checkered chickens

  6. Multiple Alleles • Traits controlled by more than two alleles • Coat color in rabbits • C (dark grey) – dominant to all other alleles • Cch (Chinchilla) – dominant to Himalayan and white • Ch (himalayan) – dominant to white • c (white) - recessive

  7. Multiple Alleles Continued • Blood Type in Humans • IAIA or IAi – A • IBIB or IBi – B • IAIB – AB • ii - O

  8. Sex-linked Inheritance • Traits controlled by genes located on the sex chromosome (X). • Ex: Colorblindness and hemophilia

More Related