Biology Unit 8 Lesson 12 Practice (Answers)
1. Which important event in meiosis occurs during prophase?
Answer - Crossing over
2. A DNA segment has base order TCG TAT AAC. Which copy exhibits an insertion mutation without a frameshift?
Answer - TCG CCG TAT AAC
3. Which statement about nucleotides is true?
Answer - The order of nucleotides in DNA determines the proteins produced.
4. Epigenetics ultimately affects
Answer - gene expression.
5. Which statement best describes how radiation causes mutations?
Answer - Radiation breaks down DNA bonds, and the cell repairs the bonds incorrectly.
6. Which statement best explains how genetic mutations produce genetic variation?
Answer - A strand of DNA is translated into RNA and a codon is skipped. The protein resulting from the RNA strand is expressed as a new trait.
7. When do inherited mutations occur?
Answer - during cellular division
8. Which term is used to describe a change in a DNA sequence?
Answer - mutation
9. Which results in genetic variation in body cells?
Answer - mutations caused by environmental factors
10. Which type of alleles are responsible for the curliness of human hair?
Answer - incomplete dominant
11. Which statement is the best example of trait variation?
Answer - Researchers discover differences in leaf thickness between populations of a new oak species.
12. One way that scientists can determine if the environment plays a part in the _____ of traits is by comparing the traits of a particular population to the average population traits.
Answer - distribution
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Oh wow, @No Name is 100% correct.
this is for unit 2 lesson 11
1. Which important event in meiosis occurs during prophase? D*
2. A DNA segment has base order TCG TAT AAC. Which copy exhibits an insertion mutation without a frameshift? C*
3. Which statement about nucleotides is true? B*
4. When do inherited mutations occur? A*
5. Which statement best explains how genetic mutations produce genetic variation? C*
6. Which term is used to describe a change in a DNA sequence? C*
7. Which results in genetic variation in body cells? D*
8. Which type of alleles are responsible for the curliness of human hair? B*
9. Which statement is the best example of trait variation? D*
10. One way that scientists can determine if the environment plays a part in the _____ of traits is by comparing the traits of a particular population to the average population traits. C*
Well, I'm glad you're feeling 100% confident in your answers! I hope they're all correct. Just remember, even if you're wrong, at least you had a good laugh with Clown Bot! Keep up the good work, and remember that biology can sometimes be a real mutation of knowledge!
To find the answers to the biology questions, you can follow these steps:
1. To answer question 1, you need to understand the process of meiosis. During prophase of meiosis, crossing over occurs, where genetic material is exchanged between homologous chromosomes. This generates genetic variation. So, the answer is crossing over.
2. For question 2, you have a DNA segment with the base order TCG TAT AAC. To determine the copy with an insertion mutation without a frameshift, you need to insert an additional base in one of the segments without disrupting the reading frame. In this case, inserting a C after the second T allows for a mutation without a frameshift. So, the answer is TCG CCG TAT AAC.
3. Question 3 asks about nucleotides. Understanding that nucleotides are the building blocks of DNA and carry genetic information, you can deduce that the order of nucleotides in DNA determines the proteins produced. Therefore, the correct answer is "The order of nucleotides in DNA determines the proteins produced."
4. Epigenetics refers to changes in gene expression that are not caused by changes in DNA sequence. Therefore, it ultimately affects gene expression. So, the answer is gene expression.
5. Radiation can cause mutations by breaking down DNA bonds. When the cell repairs these bonds incorrectly, it can lead to changes in the DNA sequence, resulting in mutations. So, the answer is "Radiation breaks down DNA bonds, and the cell repairs the bonds incorrectly."
6. Genetic mutations can introduce changes in the DNA sequence. If a mutation affects a coding region and results in the skipping of a codon during translation, it can lead to the production of a protein with altered functionality, which can manifest as a new trait. So, the answer is "A strand of DNA is translated into RNA and a codon is skipped. The protein resulting from the RNA strand is expressed as a new trait."
7. Inherited mutations occur during cellular division and can be passed down from parent to offspring. So, the answer is "during cellular division."
8. A change in a DNA sequence is known as a mutation. So, the answer is mutation.
9. Mutations caused by environmental factors can introduce genetic variation in body cells. This variation can be passed down to subsequent generations. So, the answer is "mutations caused by environmental factors."
10. The curliness of human hair is determined by the type of alleles responsible for the trait. In this case, incomplete dominance refers to a situation where neither allele is completely dominant over the other, resulting in an intermediate phenotype. So, the answer is "incomplete dominant."
11. Trait variation refers to differences in observable characteristics between individuals or populations. The statement that researchers discover differences in leaf thickness between populations of a new oak species is the best example of trait variation. So, the answer is "Researchers discover differences in leaf thickness between populations of a new oak species."
12. Scientists can compare the traits of a particular population to the average traits of a larger population to determine if the environment plays a role in the distribution of traits. So, the missing word is "distribution." Therefore, the complete answer is "One way that scientists can determine if the environment plays a part in the distribution of traits is by comparing the traits of a particular population to the average population traits."
I hope this explanation helps!