Biology 1001A Study Guide - Sequential Hermaphroditism, Promiscuity, Collision Theory

• School: Western University
• Department: Biology
• Course: Biology 1001A
• Professor: Tom Haffie

Document Summary

Lecture 12: strategy to distinguish between a phenotype that results from codominance relative to incomplete dominance (cid:120) White alleles make no pigment whatsoever (cid:120) of course, when crossed, the pink flowers can produce both red and white flowers (cid:120) They simply mask the effects of the recessive alleles and determine the phenotype (cid:120) an allele isn"t always dominant all the time (a dominant over o blood type but codominant with b blood type). High cyclic amp makes black melanin (cid:120) but under the influence of certain hormones, cyclic amp levels can fall and the. In heterozygotes, b and w alleles are both present (cid:120) the b allele is on all the time, while the w allele is sensitive to hormonal stimulation. The b allele masks the effects of the w allele by coding for black melanin even though cyclic amp levels are low, creating black skin/hair (cid:120) the r allele is off all the time and produces red melanin (cid:120)