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Unformatted text preview: with, there are two complete homologous sets of chro-mosomes in each nucleus, a condition known as diploidy . Genes are functional regions in the long, continuous coiled piece of DNA that constitutes a chromosome. There are other DNA segments between genes, and this intergenic material differs in its extent and nature in dif-ferent species. In higher organisms much of this intergenic DNA is repetitive and of unknown function. Since a diploid cell has two sets of chromosomes, genes therefore are present in pairs. However, although Figure 3-1 Transmission of genes and chromosomes at mitosis and meiosis. CHAPTER OVERVIEW Figure MITOSIS MEIOSIS Centromeres Premitotic DNA replication Premeiotic DNA replication Single division Two divisions A AA a Two daughter cells also of genotype / Four haploid meiotic products , Heterozygous diploid ( / ) 1 2 1 2 44200_03_p73-114 3/3/04 1:47 PM Page 74...
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- Spring '08