Dihybrid Crosses and Polygenic Traits

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Presentation transcript:

Dihybrid Crosses and Polygenic Traits The Basis of Heredity Dihybrid Crosses and Polygenic Traits

Review pg 612 18.4 #1

Evidence of Independent Assortment A cross that involves with two independent traits that are present in alternate forms Mendel crossed garden peas – first pure (homozygous) two dominant and two recessive 2nd Law – genes that are located on different chromosomes assort independently Mendel’s 2nd Law: Law of Independent Assortment

1st Law – law of segregation The alleles of both of these genes will segregate during meiosis

Probability and Dihybrid Crosses Sample Exercise 1 pg. 615-616 Probability that two outcomes will occur at the same time

9:3:3:1 F1 progeny self-fertilizes into F2 generation. Mendel examined the phenotypes produced. A Punnett square analysis of the genotype confirms Mendel’s theory about independent assortment.

Harry Potter and Dragon Genetics