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Multiple Choice
Which of the following statements best describes homologous chromosomes?
A
They are pairs of chromosomes that have the same genes at the same loci, but possibly different alleles.
B
They are identical copies of a single chromosome, formed during DNA replication.
C
They are chromosomes that are involved in the process of crossing over during mitosis.
D
They are chromosomes that determine the sex of an organism.
Verified step by step guidance
1
Understand the definition of homologous chromosomes: Homologous chromosomes are pairs of chromosomes in a diploid organism that have the same genes at the same loci, but they may have different alleles.
Differentiate between homologous chromosomes and sister chromatids: Sister chromatids are identical copies of a single chromosome formed during DNA replication, whereas homologous chromosomes are not identical but similar in structure and gene content.
Consider the role of homologous chromosomes in meiosis: During meiosis, homologous chromosomes pair up and may exchange genetic material through a process called crossing over, which increases genetic diversity.
Clarify the difference between homologous chromosomes and sex chromosomes: Sex chromosomes determine the sex of an organism (e.g., X and Y chromosomes in humans), while homologous chromosomes refer to any pair of chromosomes with the same gene sequence.
Evaluate the given statements: Based on the definitions and roles discussed, identify the statement that accurately describes homologous chromosomes as having the same genes at the same loci, but possibly different alleles.