Chromosomes of Thaliaceans

Somatic Chromosomes of Long-Eared Desert Hedgehog Hemiechinus auritus

Separation of lentil root tip chromosomes by colchicine

I-18: The Role of Sex Chromosomes in Female Germ Cell Differentiation

Background When gonadal sex reversal occurs in mammalian species, the resultant XX males and XY females become infertile or subfertile, suggesting critical roles of sex chromosomes in germ cell differentiation. The objective of our study is to clarify the mechanism of infertility in the B6.YTIR (XY) sex-reversed female mouse, which can be attributed to a failure in the second meiotic division i...

Physical Maps of Chromosomes

A bouquet of chromosomes.

During meiotic prophase, telomeres attach to the inner nuclear envelope and cluster to form the so-called meiotic bouquet. Although this has been observed in almost all organisms studied, its precise function remains elusive. The coincidence of telomere clustering and initiation of chromosome synapsis has led to the hypothesis that the bouquet facilitates homologous chromosome pairing and synap...