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MCAT Biological and Biochemical Foundations of Living Systems Flashcards: 1c Meiosis Genetic Variation

Study 1c Meiosis Genetic Variation in MCAT Biological and Biochemical Foundations of Living Systems with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.

QUESTION

What is the key structural difference between homologous chromosomes and sister chromatids?

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ANSWER

Homologs: maternal vs paternal; sisters: identical copies after S phase. Homologs differ in parental origin and may have allelic variations, while sisters are replication products.

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MCAT Biological and Biochemical Foundations of Living Systems: Foundational Concept 1: Biomolecules and Metabolism

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This deck focuses on 1c Meiosis Genetic Variation, giving you a quick way to review the definitions, rules, and examples that matter most for MCAT Biological and Biochemical Foundations of Living Systems.

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Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Practice questions

1 of 38Practice questions for this set
In a population study of wild Drosophila melanogaster, investigators crossed females heterozygous for two linked markers on chromosome 2 (A and B) with males homozygous recessive (ab/ab). Female germ cells were exposed to a brief heat pulse during early prophase I, a condition previously associated with increased double-strand break formation. Offspring were scored for parental (AB, ab) versus recombinant (Ab, aB) phenotypes. Across replicates, the recombinant fraction increased from 8% (control) to 18% (heat pulse), while total offspring number was unchanged. Which outcome is most likely due to crossing over during meiosis in the heat-pulse group?
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