Question about genetics

[brianzor]

So I'm planning on pairing my male Butter 100% het genetic stripe to my female genetic stripe. I'm trying to figure out what I can produce using a Punnett square. Maybe I can get some insight if I'm doing this right.



I'm trying to produce a butter genetic stripe.


Sent from my iPhone using Tapatalk

[Eric Alan]

Not quite - you're missing out on the Butter het Genetic Stripe possibility.

When done properly, the results will be the following:

Butter het Genetic Stripe x Genetic Stripe
* 25% Butter Genetic Stripe
* 25% Genetic Stripe
* 25% Butter het Genetic Stripe
* 25% het Genetic Stripe

[Ax01]

you're not taking into account that u might get a Butter het G-Stripe. u have a 25% chance of that including a 25% of each of the ones u already calculated.

Edit: also nice pairing. Butter G-Stripes are gorgeous!

[brianzor]

Ok I didn't know if they would be one or the other. I was wondering how I would be able to map genetics without the use of the genetics calculators. Are there any easy ways using multiple genes?


Sent from my iPhone using Tapatalk

[Eric Alan]

Butter het Genetic Stripe (BbGg) x Genetic Stripe (bbgg)

	bg	Results
BG	BbGg	25%: Butter het Genetic Stripe
bG	bbGg	25%: het Genetic Stripe
Bg	Bbgg	25%: Butter Genetic Stripe
bg	bbgg	25%: Genetic Stripe

[Eric Alan]

It's easier (in my head anyway) to think of it this way:

First, I'm working with only one incomplete dominant gene, so half of the offspring will carry it, and half won't.

• 50% Butter, 50% non-Butter

Next, I'm working with one visual recessive parent, and one het recessive parent. Half of the offspring will be visual recessives, the other half will be hets.

• 50% of the Butters will be Genetic Stripe, the other 50% will be het Genetic Stripe
• Same goes for the non-Butters - 50% GS, 50% het GS

Drawing this out to its conclusion will give me the following results:

• 25% Butter Genetic Stripe, 25% Butter het Genetic Stripe, 25% Genetic Stripe, 25% het Genetic Stripe

[piedlover79]

This page can teach you about how to set up more complicated Punnett Squares: http://scienceprimer.com/punnett-square-calculator

[brianzor]

Thanks Eric Alan that helped a lot. So how would I go about adding a second recessive gene such as het hypo? Would it be BbGgHh?


Sent from my iPhone using Tapatalk

[Eric Alan]

Thanks Eric Alan that helped a lot. So how would I go about adding a second recessive gene such as het hypo? Would it be BbGgHh?


Sent from my iPhone using Tapatalk

Yep! You just need to remember to have the locus represented in both parents to keep it balanced and have the results come out correctly. If one were het Hypo and the other were not, you'd have one hH and one HH.

The fun part will come when you try to figure out the phenotypes in pairings that only involve heterozygous recessive animals. Remember - you can't visually tell the difference between HH and Hh. That's where the 66%, 50%, etc possible het terms come into play in this hobby.

[paulh]

Notice that in post 5, Eric Alan used a Punnett square, which produces all possible combinations of sperm and egg. And in post 6, he used the forkline method to get the same result. Here is a link in which both are shown: https://en.wikipedia.org/wiki/Punnett_square

Both methods produce the same result. IMO, both methods are equally effective with a mating where there is only one gene pair of interest. When two or more gene pairs are involved, I can do a forkline in half the time needed for the equivalent Punnett square.

And for me, using fractions (1/4, 1/16, 1/64, etc.) is easier than using the equivalent fractions (25%, 6.25%, 1.5625%, etc.). YMMV.