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Genetics: The study of how traits are passed from parents to offspring.
Heredity: Passing of traits from parents to offspring.
Gene: A segment of DNA that determines traits.
Chromosome: A structure made of DNA that carries genetic information.
Mitosis: A type of cell division that produces two identical body cells.
Meiosis: A type of cell division that produces four genetically different sex cells.
Haploid: A cell that contains one set of chromosomes.
Diploid: A cell that contains two sets of chromosomes.
Genetic Variation: Differences in DNA among individuals.
Reading Comprehension Questions
Section 1: What Is Genetics?
1. What is heredity? is the passing of traits from parents to offspring.
2. Where are genes found? Genes are found on DNA, which is organized into chromosomes in the cell nucleus.
3. Why don’t offspring look exactly like their parents? because of genetic variation different combinations of parental genes
Section 2: Mitosis
1. What is the purpose of mitosis? is growth, tissue repair, and producing identical body
2. How many daughter cells are produced? Two daughter cells are produced
3. Why are the daughter cells identical? because the parent cell’s DNA is replicated and then evenly divided so each daughter gets the same set of chromosomes.
Section 3: Meiosis
1. What type of cells are made during meiosis? Meiosis makes sex cells gametes — sperm and eggs
2. How many cells are produced? Four cells are produced.
3. Why are the daughter cells different from each other? because of crossing over and independent assortment during meiosis, which shuffle genetic material and produce unique combinations
Section 4: Haploid vs. Diploid
1. What does diploid mean? Diploid means a cell has two sets of chromosomes (one set from each parent
2. Which cells in your body are haploid? Haploid cells in your body are the gametes (sperm and egg)
3. Why must gametes be haploid? Gametes must be haploid so that when two gametes fuse at fertilization the resulting zygote has the correct diploid number
Section 5: Genetic Variation
1. What is genetic variation? Genetic variation is the differences in DNA among individuals
2. Name one source of genetic variation. One source of genetic variation is crossing over during meiosis
3. Why is genetic variation important? Genetic variation is important because it allows populations to adapt to changing environments, increases survival chances, and is the raw material for evolution.
Practice Quiz
Multiple Choice:
1. Mitosis results in:
A. Four different cells
B. Two identical cells
C. Four identical cells
D. One haploid cell
2. Meiosis produces:
A. Body cells
B. Somatic cells
C. Gametes
D. Bone cells
3. Haploid cells contain:
A. Double the chromosomes
B. Half the chromosomes
C. No chromosomes
D. Identical chromosomes
4. Genetic variation is created during:
A. Mitosis
B. Meiosis
C. Cytokinesis
D. DNA replication
Short Answer:
1. Explain one difference between mitosis and meiosis.
2. Why does fertilization restore the diploid number?
3. Describe how crossing over increases variation.
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I finished and corrected the reading-comprehension answers and completed the practice quiz.
Reading Comprehension — completed answers
Section 1: What Is Genetics?
1. What is heredity? Heredity is the passing of traits from parents to offspring.
2. Where are genes found? Genes are found on DNA, which is organized into chromosomes in the cell nucleus.
3. Why don’t offspring look exactly like their parents? Offspring don’t look exactly like their parents because of genetic variation produced by processes such as independent assortment, crossing over during meiosis, and random fertilization, which create different combinations of parental genes.
Section 2: Mitosis
1. What is the purpose of mitosis? The purpose of mitosis is growth, tissue repair, and producing identical body (somatic) cells.
2. How many daughter cells are produced? Two daughter cells are produced.
3. Why are the daughter cells identical? The daughter cells are identical because the parent cell’s DNA is replicated and then evenly divided so each daughter gets the same set of chromosomes.
Section 3: Meiosis
1. What type of cells are made during meiosis? Meiosis makes sex cells (gametes) — sperm and eggs.
2. How many cells are produced? Four cells are produced.
3. Why are the daughter cells different from each other? They are different because of crossing over and independent assortment during meiosis, which shuffle genetic material and produce unique combinations; plus random fertilization further increases differences.
Section 4: Haploid vs. Diploid
1. What does diploid mean? Diploid means a cell has two sets of chromosomes (one set from each parent).
2. Which cells in your body are haploid? The haploid cells are the gametes (sperm and egg).
3. Why must gametes be haploid? Gametes must be haploid so that when two gametes fuse at fertilization the resulting zygote has the correct diploid number.
Section 5: Genetic Variation
1. What is genetic variation? Genetic variation is the differences in DNA among individuals.
2. Name one source of genetic variation. One source is crossing over during meiosis.
3. Why is genetic variation important? Genetic variation is important because it allows populations to adapt to changing environments, increases the chances of survival under new conditions, and is the raw material for evolution.
Practice Quiz — Answers
Multiple choice
1. Mitosis results in:
B. Two identical cells
2. Meiosis produces:
C. Gametes
3. Haploid cells contain:
B. Half the chromosomes
4. Genetic variation is created during:
B. Meiosis
Short answer (model responses)
1. Explain one difference between mitosis and meiosis.
- Mitosis produces two genetically identical diploid somatic cells through one division and is used for growth and repair; meiosis produces four genetically different haploid gametes through two divisions and includes crossing over and independent assortment.
2. Why does fertilization restore the diploid number?
- Each gamete is haploid (one set of chromosomes). When two haploid gametes fuse during fertilization, their chromosome sets combine, restoring the full diploid number in the zygote.
3. Describe how crossing over increases variation.
- During prophase I of meiosis, homologous chromosomes pair and exchange segments of DNA (crossing over). This produces chromosomes with new combinations of alleles, so gametes carry different allele mixes than the parent chromosomes, increasing genetic variation in offspring.
If you want, I can turn this into a printable worksheet, make flashcards from the key terms, or give a short quiz with answers hidden for self-testing.
Reading Comprehension — completed answers
Section 1: What Is Genetics?
1. What is heredity? Heredity is the passing of traits from parents to offspring.
2. Where are genes found? Genes are found on DNA, which is organized into chromosomes in the cell nucleus.
3. Why don’t offspring look exactly like their parents? Offspring don’t look exactly like their parents because of genetic variation produced by processes such as independent assortment, crossing over during meiosis, and random fertilization, which create different combinations of parental genes.
Section 2: Mitosis
1. What is the purpose of mitosis? The purpose of mitosis is growth, tissue repair, and producing identical body (somatic) cells.
2. How many daughter cells are produced? Two daughter cells are produced.
3. Why are the daughter cells identical? The daughter cells are identical because the parent cell’s DNA is replicated and then evenly divided so each daughter gets the same set of chromosomes.
Section 3: Meiosis
1. What type of cells are made during meiosis? Meiosis makes sex cells (gametes) — sperm and eggs.
2. How many cells are produced? Four cells are produced.
3. Why are the daughter cells different from each other? They are different because of crossing over and independent assortment during meiosis, which shuffle genetic material and produce unique combinations; plus random fertilization further increases differences.
Section 4: Haploid vs. Diploid
1. What does diploid mean? Diploid means a cell has two sets of chromosomes (one set from each parent).
2. Which cells in your body are haploid? The haploid cells are the gametes (sperm and egg).
3. Why must gametes be haploid? Gametes must be haploid so that when two gametes fuse at fertilization the resulting zygote has the correct diploid number.
Section 5: Genetic Variation
1. What is genetic variation? Genetic variation is the differences in DNA among individuals.
2. Name one source of genetic variation. One source is crossing over during meiosis.
3. Why is genetic variation important? Genetic variation is important because it allows populations to adapt to changing environments, increases the chances of survival under new conditions, and is the raw material for evolution.
Practice Quiz — Answers
Multiple choice
1. Mitosis results in:
B. Two identical cells
2. Meiosis produces:
C. Gametes
3. Haploid cells contain:
B. Half the chromosomes
4. Genetic variation is created during:
B. Meiosis
Short answer (model responses)
1. Explain one difference between mitosis and meiosis.
- Mitosis produces two genetically identical diploid somatic cells through one division and is used for growth and repair; meiosis produces four genetically different haploid gametes through two divisions and includes crossing over and independent assortment.
2. Why does fertilization restore the diploid number?
- Each gamete is haploid (one set of chromosomes). When two haploid gametes fuse during fertilization, their chromosome sets combine, restoring the full diploid number in the zygote.
3. Describe how crossing over increases variation.
- During prophase I of meiosis, homologous chromosomes pair and exchange segments of DNA (crossing over). This produces chromosomes with new combinations of alleles, so gametes carry different allele mixes than the parent chromosomes, increasing genetic variation in offspring.
If you want, I can turn this into a printable worksheet, make flashcards from the key terms, or give a short quiz with answers hidden for self-testing.
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