Please Check my HW

[aureptiles]

Hi guys,

I'm slowly getting the hang of genetics and punnett squares. I'm a little confused about the coding though.

For example, this is one of the practice problems I was working on: Bumble bee + Bumble bee. (s=spider, n=noprmal, p=pastel)

-------sp------sn------pn------nn

sp----spsp----spsn----sppn----spnn

sn----snsp----snsn----snpn----snnn

pn----pnsp----pnsn----pnpn----pnnn

nn----nnsp----nnsn----nnpn----nnnn

Here's my intepretation of the codes:
spsp = Bumble(homo spider)?
snsp = bumble bee?
pnsp = bumble bee?
snsn = spider
nnsp = bumble bee?
snnn = normal het spider
pnpn = pastel
pnnn = normal het pastel
nnnn = normal

The ones marked with question marks are the ones i'm not certain of.

Does the order of the letters matter? eg. spsp = bumble, but sspp = killer

Thanks for your help

[Bleepr]

Close, you are getting it. However, the morphs you have (Pastel + Spider) are co-dominant morphs meaning they have no "het" form, they either present myself or they don't. As far as I know, a there is no super spider.

A Bumble x Bumble will get you:
25% Normals
25% Pastel
25% Spiders
25% Bumble Bees

[Corvid]

As of now there is no "Super" Spider, but It is possible if you breed a bumble bee x bumble bee that you could get homozygous spiders. Meaning it would look like like any other spider, but when bred to a normal you would get 100% (heterozygous) spiders. Spider is dominant, meaning there is no "super" form, homos and hets look the same.
I have also heard that the homo spider may be lethal and the snakes do not survive, but I have no experience with that.

You square is spot on, but your interpretation is a little off.
whenever you see one p or 1 s, you have either a spider or a pastel.
When you see 2 p's that's a super pastel, so you can create Super Pastels (pnpn) and Super Pastel Spiders (spnp or spsp)

Regular bumble bee would be (spsn or snpn)

Hope this helps!

[Bleepr]

My bad. I gave you the Bumbe X Normal odds.

But yes, Corvid is right. Your square is correct, but you do need to upper or lower case the letters so that you can understand which are the represented morph. IE a Bumble is SnPn meaning that its a shows both pastel and spider genes.

[aureptiles]

Thank you guys, didn't know killer bees are possible in this combination. I thought the only way was to make a superpastel first, then breed it with a spider.

[aureptiles]

here're my new answers

spsp = killer
snsp = bumble
pnsp = Killer
snsn = spider
nnsp = bumble
snnn = Spider
pnpn = Super Pastel
pnnn = Pastel
nnnn = normal

[mainbutter]

Close, you are getting it. However, the morphs you have (Pastel + Spider) are co-dominant morphs meaning they have no "het" form, they either present myself or they don't. As far as I know, a there is no super spider.

A Bumble x Bumble will get you:
25% Normals
25% Pastel
25% Spiders
25% Bumble Bees

Am I the only one who has serious issues with people saying that there is no such thing as heterozygous pastel(or any other dom/co-dom gene)?

I realize it's all semantics, but "regular pastels" ARE heterozygous pastels.

[Corvid]

here're my new answers

spsp = killer
snsp = bumble
pnsp = Killer
snsn = spider
nnsp = bumble
snnn = Spider
pnpn = Super Pastel
pnnn = Pastel
nnnn = normal

Much better!
If you breed a spider x super pastel you get
50% Bumble bees
50% Pastels

UNLESS you happen to have one of those homo spiders, then you get 100% bumbles!

[RandyRemington]

Am I the only one who has serious issues with people saying that there is no such thing as heterozygous pastel(or any other dom/co-dom gene)?

I realize it's all semantics, but "regular pastels" ARE heterozygous pastels.

I'm with you on this. I think that realizing that pastels and spiders are hets makes it much easier to predict offspring from complex crosses.

Also, I'm not sure what the latest official notation is but I like the upper and lower case letters to show that there are two different "normal" genes involved in this cross; normal for pastel and normal for spider. I would write bumblebee X bumblebee as PpSs X PpSs with the P being the pastel mutant version and p the normal for pastel version and likewise S the spider mutant and s the normal for spider.

I don't think this forum supports html tables but just in case this is how I would write the cross:


<html><table border=2><tr><td></td><td>PS</td><td>Ps</td><td>pS</td><td>ps</td>
</tr><tr><td>PS</td><td>PPSS</td><td>PPSs</td><td>PpSS</td><td>PpSs</td></tr>
<tr><td>Ps</td><td>PPSs</td><td>PPss</td><td>PpSs</td><td>Ppss</td></tr><tr><td>
pS</td><td>PpSS</td><td>PpSs</td><td>ppSS</td><td>ppSs</td></tr><tr><td>ps</td>
<td>PpSs</td><td>Ppss</td><td>ppSs</td><td>ppss</td></tr></table></html>

But I'm not at all sure any of the homozygous spider (SS) combos hatch.

[Corvid]

I'm pretty sure that technically PpSs would be the correct way to write out a bumble bee (or maybe it would be PpSsnnllii etc..) [to show that it's not a lesser pied as well ] but I think for someone who is starting to understand genetics and trying to get their head wrapped around it that it's ok to write it PnSn. Just because that gives them more of a visual that the ones that are not expressed will be normal.
It's not like when you sell your snake you have to give a huge write up about it (although I'm the type of person who would appreciate it!), so whatever helps you figure it out is the best way to do it.

I am with you 100% on pastels being heterozygous. Lesser = a Het for Blue eyed... I wish more people would acknowlege that.