Bell Work 4/10 - Traits and Genetics

What is the basic unit of heredity that is passed from parents to offspring?

• Chromosome

• Gene

• Protein

• Cell

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AR.SCI.9-12.ABI-LS3-1

Which process results in new genetic combinations that can lead to inheritable genetic variations?

• Mitosis

• Meiosis

• Binary fission

• Budding

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AR.SCI.9-12.BI-LS3-2

If a population of rabbits has a wide variety of fur colors, which statistical concept can best explain this variation?

• Mean

• Median

• Probability

• Standard deviation

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AR.SCI.9-12.ABI-LS3-3

How do environmental factors contribute to genetic mutations?

• By altering the DNA sequence

• By changing the number of chromosomes

• By increasing cell division rate

• By decreasing protein synthesis

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AR.SCI.9-12.BI-LS3-2

Explain how the role of DNA and chromosomes is crucial in coding the instructions for characteristic traits.

• DNA and chromosomes are unrelated to trait inheritance.

• DNA contains genes, which are segments that code for traits, and chromosomes organize these genes.

• Chromosomes are proteins that directly code for traits.

• DNA is a type of protein that influences trait expression.

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AR.SCI.9-12.ABI-LS3-1

Defend the claim that viable errors during DNA replication can lead to genetic variation.

• Errors in replication always result in harmful mutations.

• Errors can introduce new alleles, which may be beneficial, neutral, or harmful, contributing to variation.

• Replication errors are corrected immediately and do not affect genetic variation.

• Errors in replication only occur in somatic cells and do not affect inheritance.

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AR.SCI.9-12.BI-LS3-2

Apply the concept of probability to explain why some traits are more common in a population than others.

• Traits are distributed randomly without any pattern.

• Traits with higher probability of being passed on are more common due to selective advantages.

• All traits have an equal chance of being expressed in a population.

• Probability does not affect trait distribution.

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AR.SCI.9-12.BI-LS3-3

What is the role of meiosis in genetic variation?

• It produces identical cells.

• It reduces the chromosome number by half and introduces variation through crossing over.

• It repairs damaged DNA.

• It duplicates the genetic material.

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AR.SCI.9-12.BI-LS3-2

How can statistics be used to predict the distribution of a genetic trait in a population?

• By calculating the average trait expression.

• By using probability models to estimate the frequency of alleles.

• By measuring the physical characteristics of individuals.

• By counting the number of individuals with the trait.

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AR.SCI.9-12.ABI-LS3-3

What is the significance of mutations caused by environmental factors in evolution?

• They always lead to negative effects on the organism.

• They can introduce new traits that may provide a survival advantage.

• They are rare and do not significantly impact evolution.

• They only affect non-coding regions of DNA.

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