Mendelian Genetics and Inheritance Patterns Quiz

Simple Mendelian inheritance refers to the inheritance of alleles that follow a strict dominant/recessive relationship. An example is the inheritance of seed shape in pea plants, where the round seed shape (RR or Rr) is dominant over the wrinkled seed shape (rr).

Incomplete dominance inheritance occurs when the heterozygote has a phenotype that is intermediate between the corresponding homozygotes. An example is the inheritance of flower color in snapdragons, where RR produces red flowers, rr produces white flowers, and Rr produces pink flowers.

Incomplete penetrance inheritance occurs when a dominant phenotype is not expressed even though an individual carries a dominant allele. An example is an individual who carries the allele for polydactyly but does not have extra fingers or toes.

<p>Incomplete dominance inheritance occurs because 50% of the protein encoded by two copies of the functional allele is not sufficient to produce the same trait as the homozygote making 100%.</p> Signup and view all the answers

<p>Incomplete penetrance inheritance occurs because even though a dominant gene may be present, the protein encoded by the gene may not exert its effects due to environmental influences or other genes that counteract its effects.</p> Signup and view all the answers