AP BIOLOGY

Detailed explanation-1: -According to Mendel, the kind of genes that ‘’disappear” in F1 pea plants are c. recessive. Mendel performed both monohybrid and dihybrid crosses on pea plants. During the first filial generation when a pure tall plant and a pure dwarf plant were crossed, the first generation that was observed is the generation F1.

Detailed explanation-2: -No recessive phenotype appears in the F1 generation. This means that both parents cannot have the recessive allele for each trait.

Detailed explanation-3: -It is almost impossible to totally eliminate recessive alleles from a population, because if the dominant phenotype is what is selected for, both AA and Aa individuals have that phenotype. Individuals with normal phenotypes but disease-causing recessive alleles are called carriers.

Detailed explanation-4: -The traits that did not appear in the F1 generation were called recessive traits. When Mendel allowed the F1 generation to self-pollinate, the recessive traits reappeared in the resulting F2 generation.

Detailed explanation-5: -Green seed and wrinkled seeds were recessive to yellow and round seeds; yellow, constricted pods were recessive to green and full pods. Dwarf stem and white flowers were recessive to tall stem and violet flowers.