On an island in the Pacific Ocean, there is a species of birds with different sized beaks, with one specific gene determining their beak size. Birds who are homozygous dominant (BB) or heterozygous (Bb) for this particular gene have small beaks, while birds who are homozygous recessive (bb) for this particular gene have big beaks. For each combination of parents below, predict the frequency with which each phenotype and genotype exists. Make sure to include gametes from each parent. 1) Homozygous Dominant ( BB ) x Homozygous Dominant ( bb ) Genotypes: Phenotypes: BB Big Beaks Bb Small Beaks Bb Hint, do your percentages above add up to 100%? 2) Homozygous Recessive ( bb ) x Heterozygous ( Bb ) Genotypes: Phenotypes: BB Big Beaks Bb Small Beaks Bb 3) Heterozygous ( Bb) x Heterozygous ( Bb ) Genotypes: Phenotypes: BB Big Beaks Bb Small Beaks Bb Review: What were all the alleles used above? How many possible genotypes do you expect to find within this species, for beak size?

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Inheritance and Mendelian Genetics

Inheritance means the passing of traits to offspring from parents. These traits could be passed either through asexual reproduction or sexual reproduction. The offspring receives the genetic material from the parents. Mendelian inheritance is a certain biological inheritance that follows the rules and principles laid down by Gregor Mendel in 1865. The initial hypothesis was considered wrong, but other inheritance theories modified the concept of inheritance and thus genetics.