Table 2.

Ratio of genetic distance to physical distance varies >500-fold among species

Species	Genetic map length (cM)	Physical map length (Mb)	Axis length (μm)§	Genetic length/ physical length (cM/Mb)	Axis length/physical length (μm/Mb)	Genetic length/axis length (cM/μm)
S. cerevisiae	4206a	12a	43b	350	3.6	98
S. pombe	2100c	13.8d	--	150	--	--
N. crassa	1075e	43f	--	25	--	--
A. thaliana	597g	135h	240i	4.4	1.8	2.5
D. melanogaster	287j	180k	--	1.6	--	--
D. melanogaster Chr X	65.3j	24k	15l	2.8	0.63	4.4
C. elegans	300	103m	29n	2.9	0.28	10
Humans	3630o	3019o	--	1.2	--	--
Human autosomes	3451o	2740o	260 –320p	1.3	0.09 – 0.12	11 – 13
M. musculus	1373o	2577o	--	0.53	--	--
M. musculus autosomes	1316o	2320o	150 – 162q	0.56	0.06 – 0.07	8.1 – 8.8

^§Axis length was measured by light microscopy of formaldehyde-fixed samples.

^aCherry et al. (1997); Mortimer et al. (1992)

^b Song et al. (2021)

^c Egel (2004)

^dWood et al. (2003)

^e Perkins and Barry (1977)

^f Galagan et al. (2003)

^gLister and Dean (1993),

^hThe Arabidopsis Genome Initiative (2000)

^I Morgan et al. (2021)

^j Comeron et al. (2012)

^k Adams et al. (2000)

^l Page et al. (2001)

^m C. elegans Sequencing Consortium. (1998)

ⁿLascarez, Lagunas and Colaiácovo, unpublished data

^o Jensen-Seaman et al. (2004)

^p Codina-Pascual et al. (2006)

^q Vranis et al. (2010)