BIOL 121 Lecture Notes - Lecture 6: Punnett Square, Gamete, Zygosity

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18 Sep 2018
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Thus, each gamete has 1 allele of each gene. Both parents are heterozygous for 2 traits. A gene can have different alleles/ variants (but each gamete only gets 1 allele of each gene) Inheritance of 1 trait doesn"t affect the inheritance of another (only true if traits are on different chromosomes, i. e. , not linked ) Segregation- alleles are separated from 1 another in parents (due to meiosis) Independent assortment- alleles of one gene sort into gametes independent. Think of the probability of a coin flip (head or tails) F1 offspring have dominant round & yellow phenotypes whether different genes are transmitted together or independently. If different genes assort independently & combine randomly to form gametes, then each heterozygous parents should produce 4 different gamete genotypes. A 4 row by 4 column punnett square results and predicts there should be 9 different offspring genotypes and 4 phenotypes.

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