Question

multiple select question
select all that apply
prior to the 20th century, the two main ideas that provided the basis for most thinking about heredity were ______.

• traits are transmitted directly from parents to offspring
• heredity occurs within species
• heredity occurs only in families
• traits in offspring are different from parents

Explanation:

Pre-20th century hereditary thinking centered on two key ideas: direct trait transmission from parents to offspring (e.g., blending inheritance concepts) and heredity being species-specific (offspring resemble their own species). "Only in families" is too narrow, and "traits different from parents" contradicts the core of pre-20th century views which emphasized similarity.

Answer:

traits are transmitted directly from parents to offspring, heredity occurs within species