Naked Science Forum

Life Sciences => Plant Sciences, Zoology & Evolution => Topic started by: Honda12Champ on 14/01/2010 21:29:57

Title: How do you hybrid crosses when dealing with more than 2 traits?
Post by: Honda12Champ on 14/01/2010 21:29:57

I was challenged by my college biology prof to complete a heptahybrid cross (thats 7 traits) of Gregor Mendel's pea plants....i was wondering how many different combinations of upper and lower case letters there are if i have label the traits as PAYRSGT?  I greatly appreciate the help  [:)]

Title: How do you hybrid crosses when dealing with more than 2 traits?
Post by: Geezer on 15/01/2010 00:35:57

128

Title: How do you hybrid crosses when dealing with more than 2 traits?
Post by: Honda12Champ on 15/01/2010 08:02:33

Thanks  [:D] I can see now how you got that number.  I have gotten close to that amount but i seem to be coming up short...if anyone would like to try and come up with all the different combinations here is what I got so far...

PAYRSGT   pAYRSGT   PaYRSGT   PAyRSGT   PAYrSGT   PAYRsGT   PAYRSgT   PAYRSGt   paYRSGT   PayRSGT   PAyrSGT   PAYrsGT   PAYRsgT   PAYRSgt   

pAYRSGt   payRSGT   PayrSGT   PAyrsGT   PAYrsgT   PAYRsgt   pAYRSgt   paYRSGt   payrSGT   PayrsGT   PAyrsgT   PAYrsgt   pAYRsgt   paYRSgt   

payRSGt   payrsGT   PayrsgT   PAyrsgt   pAYrsgt   paYRsgt   payRSgt   payrSGt   payrsgT   Payrsgt   pAyrsgt   paYrsgt   payRsgt   payrSgt   

payrsGt   payrsgt   pAyRSGT   PaYrSGT   PAyRsGT   PAYrSgT   PAYRsGt   pAYRSgT   PaYRSGt   pAYrSGT   PaYRsGT   PAyRSgT   PAYrSGt   pAYRsGT   

PaYRSgT   PAyRSGt   pAYRsGT   PaYRSgT   PAyRSGt   pAYRSgT   PaYRSGt   paYRSGT   pAyRSGT   pAYrSGT   pAYRsGT   pAYRSgT   pAYRSGt   payRSGT   

pAyrSGT   pAYrsGT   pAYRsgT   pAYRSgt   payrSGT   pAyrsGT   pAYrsgT   pAYRsgt   payrsGT   pAyrsgT   pAYrsgt   payrsgT   Payrsgt   payrsgt   

PaYrSgT   pAyRsGt   pAyrSGT   PaYrsGT   PAyRsgT   PAYrSgt   pAYRsGt   paYRSgT   PayRSGt   PaYRsgt   pAyRSgt   paYrSGt   payRsGT   PayrSgT   

PAyrsGt   pAYrsgT

Title: How do you hybrid crosses when dealing with more than 2 traits?
Post by: Geezer on 15/01/2010 16:19:13

Each letter can be either lower case or uppercase. So, there are two possible states for each letter.

The possible combinations of two states for seven positions is 2 to the power 7 which equals 128.

If there were only four positions, it would be 2^4 = 2 x 2 x 2 x 2 = 16

What would it be if there were 17 positions?

What would it be if each position could have any one of the 26 letters in the alphabet and there were 10 positions?