Question

polygeny:pleiotropy::
○ homozygous:heterozygous
○ one:many
○ many and one:one and many
○ blood type:skin color

Explanation:

1. First, understand the relationship between polygeny and pleiotropy: Polygeny is when a trait is controlled by many genes (many → one trait), and pleiotropy is when one gene affects many traits (one → many traits).
2. Analyze each option:

• "homozygous:heterozygous": These are about allele combinations, not the gene - trait relationship like polygeny and pleiotropy.
• "one:many": This is a simple ratio, not matching the specific gene - trait relationship of polygeny and pleiotropy.
• "many and one:one and many": Polygeny is many genes (many) for one trait (one), pleiotropy is one gene (one) for many traits (many). This option matches the relationship.
• "blood type:skin color": Blood type is often related to a few genes (not polygenic in the same way as skin color), and this is about specific traits, not the gene - trait relationship type.

Answer:

C. many and one:one and many (assuming the options are labeled A, B, C, D with A: homozygous:heterozygous, B: one:many, C: many and one:one and many, D: blood type:skin color)