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LS3: Heredity (Inheritance and Variation of Traits)

6 dot points across 6 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

How do humans use biotechnology to study and change genetic information?

Communicate information and evaluate the benefits and concerns of biotechnology, including genetic engineering, GMOs, and DNA fingerprinting (Louisiana Student Standards for Science, High School Biology, HS-LS3).
A standard-level answer on biotechnology for Louisiana LEAP 2025 Biology: genetic engineering and GMOs, DNA fingerprinting by gel electrophoresis, selective breeding, cloning, CRISPR, and weighing benefits against concerns.
12 min answer →

How does the structure of DNA allow it to store and copy genetic information?

Ask questions and construct an explanation about how the structure of DNA stores genetic information and is copied accurately by replication (Louisiana Student Standards for Science, High School Biology, HS-LS3-1).
A standard-level answer on DNA for Louisiana LEAP 2025 Biology: the double helix and nucleotides, the base-pairing rule (A-T, C-G), how the base sequence stores information, and how DNA replication copies it accurately.
13 min answer →

How do Punnett squares use probability to predict the outcome of a cross?

Apply concepts of statistics and probability, using Punnett squares, to explain the variation and distribution of expressed traits from a genetic cross (Louisiana Student Standards for Science, High School Biology, HS-LS3-3).
A standard-level answer on inheritance for Louisiana LEAP 2025 Biology: alleles, genotype and phenotype, dominant and recessive, and using Punnett squares and probability to predict the ratios of a monohybrid cross.
14 min answer →

How do mutations change proteins and create new genetic variation?

Make and defend a claim, based on evidence, that mutations and new genetic combinations are sources of inheritable variation (Louisiana Student Standards for Science, High School Biology, HS-LS3-2).
A standard-level answer on mutations for Louisiana LEAP 2025 Biology: substitution, insertion, and deletion, the frameshift effect, how mutations change proteins, and why mutations are the source of new alleles for evolution.
12 min answer →

How do inheritance patterns beyond simple dominance produce variation?

Apply concepts of statistics and probability to explain patterns of inheritance beyond simple dominance, including incomplete dominance, codominance, multiple alleles, polygenic, and sex-linked traits (Louisiana Student Standards for Science, High School Biology, HS-LS3-3).
A standard-level answer on non-Mendelian inheritance for Louisiana LEAP 2025 Biology: incomplete dominance, codominance, multiple alleles, polygenic traits, and sex-linked inheritance, and how each produces variation.
13 min answer →

How does the cell turn the DNA code into a protein?

Construct an explanation, based on evidence, for how the structure of DNA determines the structure of proteins through transcription and translation (Louisiana Student Standards for Science, High School Biology, HS-LS1-1).
A standard-level answer on protein synthesis for Louisiana LEAP 2025 Biology: transcription of DNA into mRNA, translation at the ribosome using codons and tRNA, and how the base sequence determines the protein.
13 min answer →