Lampbrush chromosome
(Science: cell biology) large chromosomes (as long as 1mm), actually meiotic bivalents, seen during prophase of the extended meiosis in the oocytes of some amphibia.
segments of dna form loops in pairs along the sides of the sister chromosomes, giving them a brush like appearance. These loops are not permanent structures but are formed by the unwinding of chromomeres and represent sites of very active rna synthesis.
Mutations can also influence the phenotype of an organism. This tutorial looks at the effects of chromosomal mutations, such as nondisjunction, deletion, and duplication. ..
Plants are characterized by having alternation of generations in their life cycles. This tutorial is a review of plant mitosis, meiosis, and alternation of generations. ..
This tutorial looks at sex determination via the sex chromosomes, X and Y. Read it to get more info on X and Y chromosomes and the genetic traits inherited via these two...
This tutorial is a continuation of the first lesson on chromosomal mutation. Here, find out the chromosomal aberrations involving the genes. ..
Humans are diploid creatures. This means that for every chromosome in the body, there is another one to match it. However, there are organisms that have more than two sets of chromosomes. The condition is called polyploidy. Know more about this topic through this tutorial...
Humans are diploid creatures. This means that for every chromosome in the body, there is another one to match it. However, there are organisms that have more than two sets of chromosomes. The condition is called polyploidy. Know more about this topic through this tutorial...