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Mendel’s Laws and Di-Hybrid Crosses

MENDELS 1 ST LAW The Law of Segregation states: Alleles of a gene exist in pairs but when gametes (sex cells) are formed the members of each pair pass into different gametes. This means that a gamete has only one allele of each gene.

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Mendel’s Laws and Di-Hybrid Crosses

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  1. MENDELS 1ST LAW • The Law of Segregation states: • Alleles of a gene exist in pairs but when gametes (sex cells) are formed the members of each pair pass into different gametes. • This means that a gamete has only one allele of each gene. • At fertilisation the offspring will have two alleles again, one from each parent. • MENDELS 2ND LAW • The Law of Independent Assortment state: • At Gamete formation, the separation of one pair of alleles is completely independent to the separation of all other alleles. • Example: • If we look at an organism with two genes e.g. AaBb, each of the A’s can join with either of the B’s at gamete formation. • Thus we can have four gametes: AB, Ab, aB and ab. Mendel’s Laws and Di-Hybrid Crosses

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