Glossary Meiosis allele One of two or more molecular forms of a gene that arise by mutation and code for different versions of the same trait. asexual reproduction Any reproductive mode by which offspring arise from a single parent and inherit the genes of that parent only. crossing over At prophase I of meiosis, an interaction in which nonsister chromatids of a pair of homologous chromosomes break at corresponding sites and exchange segments; genetic recombination is the result. diploidy Presence of two of each type of chromosome (i.e., pairs of homologous chromosomes) in a cell nucleus at interphase. Compare haploidy. egg Mature female gamete; an ovum. fertilization [L. fertilis, to carry, to bear] The fusion of a sperm nucleus with the nucleus of an egg, thus forming a zygote. gamete [Gk. gametes, husband, and gamete, wife] Haploid cell, formed by meiotic cell division of a germ cell; required for sexual reproduction. Eggs and sperm are examples. gene
This is the end of the preview.
access the rest of the document.
Germ cell, Mature female gamete, Mature male gamete