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Multiple Choice
Which of the following best represents a homologous chromosome pair?
A
A tetrad
B
A zygote
C
A gamete
D
A chromatid
Verified step by step guidance
1
Step 1: Begin by understanding the concept of homologous chromosomes. Homologous chromosomes are pairs of chromosomes that have the same structure, size, and gene sequence, but may carry different alleles for the same genes. They are inherited from each parent (one from the mother and one from the father).
Step 2: Review the definitions of the terms provided in the options: A tetrad, a zygote, a gamete, and a chromatid. Each term represents a different biological structure or stage in cell division.
Step 3: Recall that a tetrad forms during meiosis when homologous chromosomes pair up and align closely together. This pairing is essential for genetic recombination and segregation during meiosis.
Step 4: Compare the other options: A zygote is a fertilized egg cell formed by the union of two gametes, and it does not represent homologous chromosomes. A gamete is a haploid reproductive cell (sperm or egg) and contains only one set of chromosomes, not homologous pairs. A chromatid is one of two identical halves of a duplicated chromosome, not a pair of homologous chromosomes.
Step 5: Conclude that the term 'tetrad' best represents a homologous chromosome pair because it specifically refers to the structure formed during meiosis when homologous chromosomes pair up.