TEAS Mendel's Laws & Genetics Practice Questions

5 free Mendel's Laws & Genetics practice questions

Pick an answer and check it to see the full step-by-step explanation.

1. Question 1
   A genetics lab is studying two linked genes (A and B) to estimate how often crossing over separates them. Which statement best describes what crossing over does to these genes during meiosis?

   It exchanges segments between non-sister chromatids of homologous chromosomes during prophase I, creating new allele combinationsIt happens during interphase (S phase) as DNA replicates, increasing the number of chromosomesIt occurs during anaphase I when homologous chromosomes separate, preventing recombinationIt swaps DNA segments between sister chromatids during metaphase II, producing identical gametes

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2. Question 2
   A student compares recombination frequencies between two pairs of linked genes in a pedigree study. Pair 1 shows 4% recombination, and Pair 2 shows 18% recombination. Which conclusion is most accurate?

   Pair 2 genes are farther apart on the same chromosome than Pair 1 genesPair 2 genes will always assort independently because recombination is greater than 10%Pair 1 genes are on different chromosomes while Pair 2 genes are on the same chromosomePair 1 genes cannot undergo crossing over because their recombination frequency is low

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3. Question 3
   A nursing student reviews a genetics handout stating that the recombination frequency between two genes is about 50%. What does this most strongly suggest about the relationship between these genes?

   Crossing over between these genes occurs during mitosis rather than meiosisThe genes are on the same chromosome and always inherited togetherThe genes are so close together that crossing over rarely separates themThe genes are effectively unlinked, behaving like genes on different chromosomes due to frequent recombination

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4. Question 4
   A genetic counselor explains that crossing over during meiosis can change which allele combinations are passed to offspring. During which stage and between which structures does crossing over occur to produce recombinant chromatids?

   Anaphase II; between homologous chromosomes as they separateMetaphase I; between sister chromatids of the same chromosomeProphase I; between non-sister chromatids of homologous chromosomesTelophase I; between non-homologous chromosomes after cytokinesis

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5. Question 5
   A student analyzes offspring from a testcross and finds that 8% of gametes are recombinant for two genes on the same chromosome. Which conclusion best matches this result?

   The genes are linked and relatively close together on the same chromosomeThe genes are on different chromosomes and assort independentlyCrossing over occurs during mitosis, producing the recombinant gametesThe genes must be on the X chromosome because recombination is less than 10%

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