QQuestionBiology
QuestionBiology
Which statement about the difference between homologous chromosomes and sister chromatids is correct?
A. Homologous chromosomes and sister chromatids contain the same genes and the same alleles.
B. Homologous chromosomes contain the same genes, but may contain different alleles. Sister chromatids contain the same genes and the same alleles.
C. Sister chromatids contain the same genes, but different alleles. Homologous chromosomes contain the same genes and the same alleles.
D. Neither homologous chromosomes nor sister chromatids contain the same alleles.
Homologous chromosomes contain the same genes, but may contain different alleles. Sister chromatids contain the same genes and the same alleles.
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Answer
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Step 1:I'll solve this step by step with clear explanations:
Step 2:: Understanding Chromosome Terminology
- Homologous chromosomes are chromosome pairs with: * Same gene locations (loci) * Different possible alleles * One chromosome from maternal parent, one from paternal parent * Similar in length and gene arrangement
Step 3:: Understanding Sister Chromatids
- Sister chromatids are: * Identical copies of a single chromosome * Produced during DNA replication * Contain exactly the same genetic information * Attached at the centromere
Step 4:: Analyzing the Options
- Option A is incorrect because homologous chromosomes do NOT have the same alleles - Option B matches the correct description: * Homologous chromosomes: same genes, different possible alleles * Sister chromatids: same genes, same alleles
Step 5:: Detailed Explanation of Option B
\text{Same gene locations} = \text{Same alleles}
- Homologous chromosomes: - Sister chromatids:
Final Answer
B is the correct statement about homologous chromosomes and sister chromatids.
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