Question

respond to the following prompt in a well - formed paragraph or several bullet points. include 2 - 3 specific details (quotes) from the text. 1. in humans, blood type (a, b, ab, or o) is controlled by a single gene with more than two possible alleles. based on the reading and your knowledge of genetics, describe the inheritance patterns involved in blood type inheritance. what genotypes would result in each of these possible phenotypes? for this response, you may ignore rh factor as a trait.

Explanation:

Step1: Identify inheritance pattern

Blood - type inheritance in humans follows codominance and multiple - allele inheritance. There are three alleles: $I^A$, $I^B$, and $i$.

Step2: Determine genotypes for phenotype A

For blood type A, the genotypes can be $I^A I^A$ (homozygous) or $I^A i$ (heterozygous). The $I^A$ allele is dominant over $i$.

Step3: Determine genotypes for phenotype B

For blood type B, the genotypes are $I^B I^B$ (homozygous) or $I^B i$ (heterozygous). The $I^B$ allele is dominant over $i$.

Step4: Determine genotype for phenotype AB

For blood type AB, the genotype is $I^A I^B$. Here, $I^A$ and $I^B$ are codominant, meaning both are expressed.

Step5: Determine genotype for phenotype O

For blood type O, the genotype is $ii$. Since $i$ is recessive, two copies are needed for the O phenotype.

Answer:

Blood type A: Genotypes $I^A I^A$ or $I^A i$. Blood type B: Genotypes $I^B I^B$ or $I^B i$. Blood type AB: Genotype $I^A I^B$. Blood type O: Genotype $ii$.