In particular, it explains that humans have one fewer chromosome pair in their cells than apes, due to a mutation found in chromosome number 2 that caused two chromosomes to fuse into one.

When scientists engineered one group of mice to keep the extra X chromosome completely silent, they discovered that the normal chromosome would still express over 20 genes in aging females.

Lab safety rules dictate that one must tie back long hair. Rosemarie Hansen learned the hard way when an open flame turned her locks into a lesson. On the hunt for informative health and disease ...

World Down Syndrome Day: Down syndrome appears as a genetic disorder following abnormal cellular division which results in either an entire or partial additional chromosome 21. The body and brain ...

Based on his observations, Henking hypothesized that this extra chromosome ... beetle Tenebrio molitor (Figure 2), Stevens noted an unusual-looking pair of chromosomes that separated to form ...

14, No. 2 (Feb., 1927), pp. 53-75 (26 pages ... It is possible that, with an extra number of chromosomes in an individual, the balance of the chromosome mass is upset in such a way that certain ...

Around the same time, British biologist Charles Darwin (Figure 2) independently proposed that ... fly's cells did indeed appear to contain an extra chromosome. Specifically, these cells contained ...