AP BIOLOGY

Detailed explanation-1: -SEE A PATTERN FOR HETEROZYGOUS MONOHYBRID CROSSES: If you cross 2 parent plants that are BOTH HETEROZYGOUS for a trait the offspring will show a 3:1 phenotypic ratio. 75 25 % of the offspring will show the DOMINANT trait and % of the offspring will show the RECESSIVE trait.

Detailed explanation-2: -An example of a heterozygous genotype is one where one allele is dominant and the other is recessive. If both parents are heterozygous for a trait 15% will be have two dominant alleles and be homozygous dominant and 25% will be homozygous recessive. 50% will be heterozygous.

Detailed explanation-3: -Answer and Explanation: If two heterozygous individuals are crossed, then the phenotypic ratio of the offspring would be 3:1(dominant:recessive).

Detailed explanation-4: -The expected genotype ratio when two heterozygotes are crossed is 1 (homozygous dominant) : 2 (heterozygous) : 1 (homozygous recessive). When a phenotypic ratio of 2 : 1 is observed, there is probably a lethal allele.

Detailed explanation-5: -A dihybrid cross tracks two traits. Both parents are heterozygous, and one allele for each trait exhibits complete dominance *. This means that both parents have recessive alleles, but exhibit the dominant phenotype. The phenotype ratio predicted for dihybrid cross is 9:3:3:1.