Question

multiple-choice question which statement best describes mendelian or complete dominance? when the dominant and recessive alleles mix to form a third phenotype. when the dominant trait or allele completely masks the recessive allele. when both the dominant and recessive allele shows.

Explanation:

To determine the correct statement about Mendelian (complete) dominance, we analyze each option:

• The first option describes incomplete dominance (where alleles mix to form a new phenotype, e.g., pink flowers from red and white).
• The second option matches complete dominance: the dominant allele (or trait) fully masks the recessive allele, so only the dominant phenotype is expressed in heterozygotes (e.g., HH or Hh showing the same dominant trait).
• The third option describes codominance (both alleles are fully expressed, e.g., AB blood type).

Answer:

The correct option is: "When the dominant trait or allele completely masks the recessive allele." (The second option in the multiple - choice list)