Modification To Mendel’s Classic Ratios

University:
Northwest College
Course:
VN 220 | Medical/ Surgical
Academic year:

2025
Views:

247

Pages:

15
Author:

Esralyn Ignacio

MODIFICATION TO MENDEL’S CLASSIC RATIOS MARIA CRISTINA B. BANDARLIPE DMMMSU-LA UNION INCOMPLETE DOMINANCE OCCURS WHEN THE PHENOTYPE IS DISTINCT FROM AND INTERMEDIATE TO THE PHENOTYPES OF THE HOMOZYGOUS PHENOTYPE DOMINANT ALLELE IS PARTIALLY EXPRESSED THIRD PHENOTYPE INCOMPLETE DOMINANCE RR=red rr=white Rr=pnk CB CB=black CW CW=white CB CW=blue(Andalusian) CODOMINANCE A CROSS BETWEEN ORGANISMS WITH TWO DIFFERENT PHENOTYPES WHICH PRODUCES OFFSPRING WITH A THIRD PHENOTYPE IN WHICH BOTH OF THE PARENTAL TRAITS APPEAR TOGETHER. CODOMINANCE RW RW=white Rr Rr =red Rr RW=Roan CODOMINANCE MULTIPLE ALLELES Mendel's work suggested that just two alleles existed for each gene. Today, we know that's not always, or even usually, the case! Although individual humans (and all diploid organisms) can only have two alleles for a given gene, multiple alleles may exist in a population level, and different individuals in the population may have different pairs of these alleles. MULTIPLE ALLELES With multiple alleles, that means there are more than two phenotypes available depending on the dominant or recessive alleles that are available in the trait and the dominance pattern the individual alleles follow when combined together. MULTIPLE ALLELES MULTIPLE ALLELES Type A x Type AB MULTIPLE ALLELES Type B x Type AB MULTIPLE ALLELES –COAT COLOR Agouti (colored) MULTIPLE ALLELES –COAT COLOR C cch ch C (Agouti) (Chinchilla) (Himalayan) (Albino) CC cch cch ch ch C cch cch ch ch c C ch cch c Cc cc MULTIPLE ALLELES –COAT COLOR