Dihybrid Crosses.

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Presentation transcript:

Dihybrid Crosses

What is a Dihybrid Cross? Is a cross that involves two different traits. T t P p X T t P p What do these symbols mean? T = tall t = short P = purple flower p = white flower

When working with Dihybrid Crosses we use the FOIL method Example of a Dihybrid Genotype Bb CC First Outside Inside Last BC BC bC bC

Punnett Square Heterozygous dihybrid cross T t P p X T t P p T p T P

T p Dominant traits – T – tall P – purple flowers T P T p T T P P T P T T P p T t P P T t P p T p T T P p T T p p T t P p T t p p Recessive traits – t – short p - white t P T t P p T t P P t t P P t t P p t p T t p p T t P p t t P p t t p p Phenotypic results Short & white Tall &Purple Short & Purple Tall & White 9 3 3 1 Phenotypic ratio is 9 tall & purple: 3 short & purple: 3 tall & white: 1 short & white

The Law of Independent Assortment The genes for traits such as flower color and height sort independently. Which means that the gene for flower color is not linked with the gene for height, just because a flower is tall, doesn’t mean it will also be purple.