Question

another feature of sexual reproduction that increases genetic variation is that one individual produces a variety of gametes with different combinations of alleles. gametes are produced when specialized diploid cells, called germ cells, divide during a process called melosis. this model shows a germ cell from an organism that has two pairs of homologous chromosomes in each of its somatic cells. to prepare for meiosis, a diploid germ cell replicates, or copies its dna. once replicated, each chromosome is connected to its identical copy at a region called the centromere. each copy of a chromosome is called a sister chromatid. two sister chromatids connected at a centromere are still referred to as a single chromosome. select the true statements. the gametes produced by one organism are all genetically identical. a germ cell makes a copy of its dna before meosis begins. germ cells are still diploid after dna replication. dna replication doubles the number of chromosomes inside a germ cell.

Explanation:

• "The gametes produced by one organism are all genetically identical.": This is false. Sexual reproduction involves meiosis, which has processes like crossing - over and independent assortment that create genetic variation in gametes.
• "A germ cell makes a copy of its DNA before meosis begins.": This is true. As stated in the text, "To prepare for meiosis, a diploid germ cell replicates, or copies its DNA."
• "Germ cells are still diploid after DNA replication.": This is true. DNA replication in a diploid germ cell just duplicates the genetic material within the diploid cell. The cell still has the same number of chromosome sets (diploid).
• "DNA replication doubles the number of chromosomes inside a germ cell.": This is false. DNA replication creates sister chromatids. Each chromosome (with two sister chromatids) is still considered one chromosome. So, the number of chromosomes does not double.

Answer:

• "A germ cell makes a copy of its DNA before meosis begins."
• "Germ cells are still diploid after DNA replication."