🧬 DNA, Genes, and Heredity

🧬 Biology & Health · Quiz 003

Connect DNA, genes, alleles, genotype, phenotype, and simple Mendelian probability without implying that all biological traits follow single-gene dominant-recessive inheritance.

Learning goalConnect DNA, genes, alleles, genotype, phenotype, and simple Mendelian probability without implying that all biological traits follow single-gene dominant-recessive inheritance.

  • 5 questions
  • Foundation
  • Explanations after finishing
Answered 0/5
FoundationIn cellular organisms, which molecule stores most hereditary information passed from cell to cell and from parents to offspring?
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Think about the molecule that makes up genes and chromosomes.

UnderstandingWhat is an allele?
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Think of variation at the same genomic position.

ApplicationIn a simple Mendelian model, allele B is dominant to allele b. Which genotype is expected to show the recessive phenotype?
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A recessive phenotype appears when no dominant allele is present in this simple model.

InterpretationIn that same simple model, two heterozygous parents are crossed: Bb × Bb. What is the probability that an offspring will have genotype bb?
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List the four equally likely genotype combinations from B or b contributed by each parent.

ConnectionTwo heterozygous parents, Bb × Bb, have one child with genotype bb. Assuming each conception is independent and the parental genotypes do not change, what is the probability that their next child will also have genotype bb?
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Ask whether the outcome of one birth changes the allele probabilities for the next conception.

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