What is the difference between homologous chromosomes and sister chromatids? Different alleles are [identical/homologous/sister] versions of a gene. Genes on sister chromatids are [identical/homologous/unrelated] Homologous genes are [identical/similar/unrelated] Crossing over that recombines genetic information occurs between [homologous chromosomes/sister chromatids]. A diploid cell has [1/2/3/4] set(s) of homologous chromosomes. A haploid cell has [1/2/3/4] allele(s) for each gene in its genome. A diploid cell that has copied its DNA during [G1/S/G2/M]phase is [haploid/diplold/polyploidy]. When fertilization occurs in a diploid life cycle, [stem cells/somatic cells/gametes/zygotes] fuse into one cell, and the resulting cell is [haploid/diploid polyploidy]. The growth and development of a multicellular organism occurs through [binaryfission/mitosis/meiosis] The mitochondrion reproduces by [meiosis/mitosis/binary fission] and has [0/1/2/23] chromosome(s) Meiosis I [increases/decreases/does not change] the ploidy of the dividing cell, while meiosis II [increases/decreases/does not change] ploidy. During Meiosis I [homologous chromosomes/sister chromatids] are separated from one another, breaking the structures known as [kinetochores/chiasmata/centromeres]. The tetrad is formed during [mitosis/meiosis I/meiosis II/binary fission]. Independent assortment occurs during [mitosis/meiosis I/meiosis II/cytokinesis] If sister chromatids recombined, the resulting chromosomes would be [different/homologous/identical]. If a nondisjunction of chromosome 21 occurred during meiosis II, resulting in an aneuploid gamete, a zygote formed using this gamete could have a maximum of [1/2/3/4] copies 17.of chromosome 21. Assume that nondisjunction occurred after fertilization in what is called a post-zygotic cell (meaning after zygote has formed). The nondisjunction must have occurred during. [mitosis/meiosis I/meiosis II].