Question

before applying what you just learned about meiosis, lets activate your prior knowledge about chromosomes and ploidy. this diagram shows the chromosomes found in a hypothetical cell. colored bars indicate chromosomes, letters indicate different genes, and subscripted numbers identify different alleles. red bars represent chromosomes that came from this individuals mother (maternal chromosomes); lavender bars represent chromosomes that came from this individuals father (paternal chromosomes). recall that homologous chromosomes look the same and carry the same genes, though homologs may carry different alleles. which statements accurately describe the chromosomes in this cell? select all that apply. the chromosomes are unreplicated—no sister chromatids are present. the maternal and paternal chromosomes carry the same allele at gene c, but different alleles at gene a and gene b. the cell is n = 3, because there are three different types of chromosome present. the cell is diploid. the cell is n = 6, because there are a total of 6 chromosomes present in the cell.

Explanation:

• For the first option: In the diagram, chromosomes are shown as single bars (not as sister - chromatid pairs), so they are unreplicated.
• For the second option: At gene \(C\), both maternal (\(C_{14}\)) and paternal (\(C_{14}\)) chromosomes have the same allele. At gene \(A\), maternal has \(A_{2}\) and paternal has \(A_{1}\); at gene \(B\), maternal has \(B_{3}\) and paternal has \(B_{6}\).
• For the third option: The haploid number (\(n\)) is the number of non - homologous chromosomes in a set. Here, there are 3 different types of chromosomes in a haploid set (not \(n = 3\) because of the number of chromosome types in a diploid cell context). The correct way to calculate \(n\) is based on the number of non - homologous chromosomes in a single set. In a diploid cell, the haploid number \(n\) is the number of chromosomes in a single set. If we consider the basic set of non - homologous chromosomes, \(n=3\) (but the reasoning in the option is wrong. The cell is diploid (\(2n\)), and \(n\) is the number of chromosomes in a single set. There are 3 types of chromosomes in a single set).
• For the fourth option: The cell has two sets of chromosomes (one maternal and one paternal), so it is diploid (\(2n\)).
• For the fifth option: The haploid number \(n\) is not calculated as the total number of chromosomes. \(n\) is the number of chromosomes in a single set. Here, \(n = 3\) (not \(n=6\))

Answer:

• The chromosomes are unreplicated—no sister chromatids are present.
• The maternal and paternal chromosomes carry the same allele at gene \(C\), but different alleles at gene \(A\) and gene \(B\).
• The cell is diploid.