Final answer:
The correct genotype for someone who is heterozygous for both tongue rolling (T) and right-handedness (R) autosomal dominant traits is TtRr. Options 'a' TtRR, 'b' TTrr, and 'd' ttRR are incorrect as they do not represent heterozygosity for both traits. The correct option is c.
Step-by-step explanation:
The genotype of a person who is heterozygous for both tongue rolling (T) and right-handedness (R), which are autosomal dominant traits, is TtRr. Heterozygosity means that the individual has one dominant and one recessive allele for each trait. Since 'T' and 'R' are the dominant alleles, and 't' and 'r' are the recessive alleles, a person who is heterozygous for both traits would have one of each allele. Therefore, the correct answer between the options provided is c) TtRr.
When looking at the genetics of dominant and recessive traits, we learn that individuals with dominant traits can either be homozygous dominant (TT or RR) or heterozygous (Tt or Rr). A recessive trait only becomes phenotypically apparent when an individual is homozygous recessive (tt or rr). The pedigree charts for these traits would reflect the possible genetics that arise when crossing individuals with different genotypes. For X-linked traits, as males have one X chromosome, a recessive allele on the X chromosome will always be expressed in males, while females require two copies of the allele to express the trait. However, the question pertains to autosomal traits, meaning they are located on the numbered chromosomes, not the sex chromosomes (X or Y).