AP BIOLOGY

Detailed explanation-1: -A dominant allele is denoted by a capital letter (A versus a). Since each parent provides one allele, the possible combinations are: AA, Aa, and aa. Offspring whose genotype is either AA or Aa will have the dominant trait expressed phenotypically, while aa individuals express the recessive trait.

Detailed explanation-2: -Dominant alleles are seen as an uppercase of a letter; for example, B. Recessive alleles are seen as a lower case of a letter; b. In order for a person to show the dominant trait, one of the person’s parents must have the dominant trait (which is an uppercase letter).

Detailed explanation-3: -genotype = the genes of an organism; for one specific trait we use two letters to represent the genotype. A capital letter represents the dominant form of a gene (allele), and a lowercase letter is the abbreviation for the recessive form of the gene (allele).

Detailed explanation-4: -Heredity. In a Punnett square, capital letters represent dominant alleles. Lower case letters represent recessive alleles.

Detailed explanation-5: -In heterozygous condition, the allele which expresses itself even in the presence of another allele is called a dominant allele. The allele whose expression is suppressed in the presence of a dominant allele is called a recessive allele.