B chromosome

noun
variants: also B-chromosome

Medical Definition of B chromosome

: a small, usually heterochromatic chromosome present in addition to the normal complement of chromosomes in some members of a species

Note: B chromosomes do not contain any structural genes and have a highly variable pattern of inheritance separate from that of the normal chromosomal complement. They are most often found in plants and invertebrates.

Comments on B chromosome

What made you want to look up B chromosome? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

to speak slightingly about or to degrade

Get Word of the Day daily email!

Test Your Vocabulary

Challenging Vocabulary Quiz Returns!

  • stylized drawing of woman pole vaulting across gap to get trophy
  • Which is a synonym of fuliginous?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!