Released STAAR Biology EOC · 2025 · Item 41 · 1 point

Walkthrough: Biology 2025, Item 41

B.7C · Mutations · unscored study

Five cells are shown left to right with different arrangements of homologous chromosome pairs. Students select the two cells that show unequal separation. — Chromosome separation during sex-cell formationOriginal visual from the released STAAR test.

Some inherited health disorders are caused by nondisjunction. During nondisjunction, homologous chromosomes fail to separate properly during the formation of sex cells. Based on the images, which cells MOST LIKELY show examples of nondisjunction?

Response format: select 2 locations on the figure.

1. Understand the question

Nondisjunction means homologous chromosomes fail to separate. Look for cells in which a pair does not split evenly.

Try the question on your own first, then reveal one step at a time.

2. Solve it step by step

Practice released items for this skill Back to the lesson

Question, artwork, answer key and rationale: Texas Education Agency released STAAR test. Walkthrough steps written by TEKSForge. Studying here does not change your mastery or scores.