GCSE Biology - Genetic Diagrams #73

The video tutorial explains genetic diagrams and Punnett squares, focusing on allele combinations from two parents. It uses a mouse trait example to illustrate dominant and recessive alleles, and how to draw genetic diagrams. The tutorial also covers Punnett squares, showing how they simplify genetic predictions. An advanced example demonstrates heterozygous offspring mating, highlighting genotype and phenotype ratios. The video concludes with a reminder of the role of multiple genes and environmental factors in trait determination.

What does it mean for an offspring to be heterozygous?

What is the expected phenotypic ratio when two heterozygous normal mice are crossed?

How do environmental factors influence the expression of traits determined by genes?