BioScience Dictionary

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Ot.

Found Diploid 30 times.

Displaying results 1 to 10.

1. Allotetraploid hybrid (amphidiploid)
A hybrid , usually a plant, of two different species which has two sets of chromosomes from each of the parent species. Also see allopolyploid .

2. Alternation of generations
A life cycle in which a multicellular diploid stage is followed by a haploid stage and so on; found in land plants and many algae and fungi.

3. Autosome
A chromosome not involved in sex determination. The diploid human genome consists of 46 chromosomes, 22 pairs of autosome s, and 1 pair of sex chromosome s (the X and Y chromosomes).

4. Autosomes
The chromosomes other than the sex chromosomes . Each member of an autosome pair (in diploid organisms) is of similar length and in the genes it carries.

5. Chlamydomonas
A genus of green algae consisting of more than 600 species worldwide, living in marine, freshwater, soil, and even snow environments. They are single cell ed eukaryotic organisms ranging from 5 to 100 micrometers long which can be roughly spherical, egg shaped, or elliptical. Most species have two flagella (coming out the same side) for swimming. Most of the time they are haploid and reproduce by dividing into two ( binary fission ); when they are stressed they can form gamete s which fuse to form diploid cyst s which later divide into four haploid cells. Taxonomically they have been classified under plants, animals, and protist s. Several species from this genus are important model organisms for the study of cell biology , molecular biology , genetics , plant physiology , and biotechnology . The species most commonly used in scientific experiments is Chlamydomonas reinhardtii (also known as C. reinhardi or C. reinhardii).

6. Diploid
A full set of genetic material, consisting of paired chromsome s one chromosome from each parental set. Most animal cells except the gamete s have a diploid set of chromosomes. The diploid human genome has 46 chromosomes. Compare haploid .

7. Diploid
Cells that contain homologous chromosomes . The number of chromosomes in the cells is the diploid number and is equal to 2n (n is the number of homologous pairs).

8. Double fertilization
A characteristic of angiosperms in which a pollen tube carries two sperm cells to the female gametophyte in the ovule . One sperm cell fuses with the egg cell and gives rise to a diploid embryo The other sperm cell fuses with the two polar cells to form a triploid cell that develops into the endosperm .

9. Genomic formula
The method used to identify the number of sets of chromosome s within a cell or organism (i.e. its ploidy ). Each set is designated "n" so one set is n is haploid , two sets is 2n is diploid , three sets is 3n is triploid , four sets is 4n is tetraploid, etc. Also, 2n+1 is known as trisomy (i.e. two full sets plus a third copy of one of the chromosomes).

10. Haploid
A single set of chromosome s (half the full set of genetic material), present in the egg and sperm cells of animals and in the egg and pollen cells of plants. Human beings have 23 chromosomes in their reproductive cells. Compare diploid .

View web definitions »

Learn more about Diploid »