Biology 30 Genetics Practice Test 2026 - Free Genetics Practice Questions and Study Guide

Genes live on chromosomes, and their behavior during meiosis and fertilization explains Mendel's patterns of inheritance. During meiosis, the separation of homologous chromosomes ensures that offspring inherit one allele for a gene from each parent, accounting for the law of segregation. When gametes fuse during fertilization, the combination of alleles from two parents produces the zygote, reflecting the law of independent assortment for genes on different chromosomes. This ties the physical movement and pairing of chromosomes to how traits are passed down generation to generation. The other statements miss the core idea: genes aren’t simply floating in cytoplasm, chromosomes aren’t made only of proteins, and environmental factors don’t determine inherited traits alone.