Which living species has the most chromosomes?

Answer 1

Searching for most "chromosomes" will get an answer: http://answers.Yahoo.com/question/index?qid=20060924171612AATKxOM

It turns out it's the fern.

The Indian fern has 1260 chromosomes.

The Ophioglossum fern has 768 chromosomes.

http://www.madsci.org/posts/archives/2005-11/1131650692.Ge.r.HTML

Eh, but that's a plant. As for animals, I find:

The butterfly has 380.

hermit crab has a grand total of 254 chromosomes (127 pairs)

This answer is for largest genome size, which unfortunately is not strongly correlated with number of genes. It is the best I could do and I expect you'd find it interesting and relevant nonetheless:

The largest animal genome reported remains 133pg for P. aethiopicus (Marbled lungfish), followed by the amphibians Necturus lewisi and N. punctatus at 120pg*, followed by the amphibians Necturus maculosus and Amphiumameans and the lungfish Lepidosiren paradoxa (if one accepts Vinogradov's new estimate; three older studies placed it at 113-124pg), all at roughly 80pg.

I got the answer from: http://www.genomesize.com/statistics.php

and verified it here: http://en.wikipedia.org/wiki/Marbled_lungfish

And no it is not the goldfish (as this used to say). the gold fish has only 94 chromosomes.

Humans have 46 chromosomes and also have unique different types. Half of the chromosomes are like your father's, and the other half are your mom's

Answer 2

Aulacantha has up to 1600, Ophioglossum reticulatum (highest plant) has up to 1200, and the Ichthyomys pittieri (highest mammal) has up 94.

Answer 3

the semi aquatic rodent with 92 chromosomes

Answer 4

Mr. Rogers