AP BIOLOGY

Detailed explanation-1: -RR homozygous dominant while rr is homozygous recessive in regards to tongue rolling. Explanation: The term homozygous means same types of alleles which carry a certain trait and are responsible for dominant or recessive character.

Detailed explanation-2: -A homozygous plant contains either of the following alleles for seed shape: (RR) or (rr). The (RR) genotype is homozygous dominant and the (rr) genotype is homozygous recessive for seed shape.

Detailed explanation-3: -An organism with one dominant allele and one recessive allele is said to have a heterozygous genotype. In our example, this genotype is written Bb. Finally, the genotype of an organism with two recessive alleles is called homozygous recessive.

Detailed explanation-4: -An example of a homozygous recessive genotype would be tt, where the lower case t’s represent the recessive trait. Homozygous means the same and genotype means the gene type.

Detailed explanation-5: -RR x rr. You’ll note that 100% of all offspring are Rr, which is the genotype. Since the genotype for all offspring are the same, and the Rr genotype encodes a pink color, then 100% of the phenotypes will be pink (NOT red-remember that this is incomplete dominance).