If chromosomes fail to separate during cell division can occur. This can result in cells with the incorrect number of chromosomes which is termed . Cells with one extra chromosome are called while cells missing one chromosome are called . A person with Down’s syndrome has
Copies of chromosome .

How can you tell the difference between rough er from smooth er?

Match the reproductive structures based on their function and the system to which they belong. egg ovary sperm vas deferens vagina fallopian tube testis urethra

Cladistics is a way of classifying organisms by examining the characteristics of their ancestors and descendants and depicting the relationships in a cladogram. which of the following best describes a challenge in classifying organisms this way? a. there are millions of species on earth, and a cladogram is not a practical means for classifying all of them. b. it is impossible to tell which organisms are most closely related to each other using a cladogram. c. cladograms are detail-oriented and do not provide a useful understanding of evolutionary relationships. d. there is a limited number of ways to organize the information, so most cladograms end up looking very similar.