# Uncommon or Common Descent?

**URL:** https://discourse.peacefulscience.org/t/uncommon-or-common-descent/776
**Category:** Side Conversation
**Created:** [July 23, 2018, 7:07pm UTC](https://discourse.peacefulscience.org/t/uncommon-or-common-descent/776 "2018-07-23T19:07:12Z")
**Posts on this page:** 1
**Showing post:** 150

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### Author: ![colewd](https://avatars.discourse-cdn.com/v4/letter/c/ecd19e/32.png) [@colewd](https://discourse.peacefulscience.org/u/colewd)
#### Post date: [July 31, 2018, 4:44pm UTC](https://discourse.peacefulscience.org/t/uncommon-or-common-descent/776/150 "2018-07-31T16:44:20Z")

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If you look at figure 9 in Winston’s paper you see a module or family with at least 100 genes that is shared between rats and chimps but does not exist in humans and mice. This appears to be very unlikely from a perspective of random gene loss.

How would you explain this from and evolutionary perspective?

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