Lecture_5_Dihybrids_2011

# Lecture_5_Dihybrids_2011 - Dihybrid Crosses Probability Jan...

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Dihybrid Crosses & Probability Jan 21 nd , 2011

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Review Crossing lines that differ by one character is called a MONOHYBRID cross DOMINANT alleles are expressed in the F1 of a monohybrid cross Traits segregate in a 3:1 ratio in the F2 generation of a monohybrid cross The 3:1 ratio is actually a 1:2:1 ratio since 2/3 of the dominant class are HETEROZYGOUS

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Dihybrid Cross Shorthand Crossing lines that differ by two characters is called a DIHYBRID cross AB/ab – two linked pairs of alleles A/a;B/b – two unlinked pairs of alleles A/a • B/b – two alleles of unknown linkage
Mendel’s Dihybrid Crosses

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3:1 Ratio is Maintained Look at just round v. wrinkled: 9/16 + 3/16 = (3/4) round 3/16 +1/16 = (1/4) wrinkled Same true for yellow v. green Therefore 3:1 segregation ratio is maintained for each character
Branching Diagrams (3/4) round (1/4) wrinkled (3/4) yellow

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Lecture_5_Dihybrids_2011 - Dihybrid Crosses Probability Jan...

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