AP BIOLOGY

Detailed explanation-1: -Eye colour The allele for brown eyes (B) is dominant over the allele for blue eyes (b). So, if you have one allele for brown eyes and one allele for blue eyes (Bb), your eyes will be brown.

Detailed explanation-2: -Because blue is recessive and brown is dominant, any blue-brown heterozygote will almost definitely have a brown-eye phenotype, and the person’s eyes will be brown. To map the possible genotypes and phenotypes you can inherit from your parents, you can use a tool called a Punnett square.

Detailed explanation-3: -The heterozygous parent must have two different genes, and at least one for the dominant brown eyes (B). These parents must have the genotypes of (bb) and (Bb). There is a 50% chance of an offspring having a (Bb) genotype, and thus brown eyes.

Detailed explanation-4: -In the monohybrid cross, a testcross of a heterozygous individual resulted in a 1:1 ratio. With the dihybrid cross, you should expect a 1:1:1:1 ratio!