louisvuittonsac-pascher.info Inheritance Session

Feb. 3, 2015

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Session Transcript - Science - Biology, 1/28/2015 8:25PM - louisvuittonsac-pascher.info- louisvuittonsac-pascher.info
Session Date: 1/28/2015 8:25PM ET
Length: 25.5 minute(s)
Subject: Science - Biology

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System Message
[00:00:00] *** Please note: All sessions are recorded for quality control. ***

Guest (Customer)
[00:00:00] codominance and incomplete dominance. A=black, a=white, Aa=gray. A gray mouse crossed with a white mouse.

Kimberly B (Tutor)
[00:00:16] HI and welcome to louisvuittonsac-pascher.info !

Guest (Customer)
[00:00:24] hi

Kimberly B (Tutor)
[00:00:26] My name is Kim and I'm happy to help you with this problem.
[00:00:31] How are you today?

Guest (Customer)
[00:00:37] good how are you

Kimberly B (Tutor)
[00:01:05] I'm pretty good, thanks

Guest (Customer)
[00:01:46] im not sure how to put these into a cross and also im not sure how to tell if its codominance or imcomplete

Kimberly B (Tutor)
[00:02:06] LOL- just what I was going to ask you if you needed to pick one or the other.
[00:02:17] Let's start how to put into the cross, maybe?

Guest (Customer)
[00:02:22] ok

Kimberly B (Tutor)
[00:02:24] And then we can discuss co vs. incomplete
[00:02:39] Ok, so I take from the description that any A allele will give black or gray

Guest (Customer)
[00:02:44] i know how to cross i just don't know how to make a cross for these types of problems

Kimberly B (Tutor)
[00:02:48] so what must the white mouse genotype be?
[00:03:03] I figured that's what you meant- once we have the genotypes set, the Punnett is easy
[00:04:25] Any ideas about the genotype for the white mouse here, or is that mostly where you're stuck?

Guest (Customer)
[00:04:57] a

Kimberly B (Tutor)
[00:05:09] Right- must have the lower case (recessive) allele
[00:05:14] It needs two alelles though
[00:05:18] *alleles

Guest (Customer)
[00:05:22] aa??

Kimberly B (Tutor)
[00:05:25] That's right
[00:05:51] And the problem is clear about defining the gray mouse as Aa
[00:06:19] So that's your cross
[00:06:27] Did that help with your questions on that?

Guest (Customer)
[00:06:56] yes thank you

Kimberly B (Tutor)
[00:07:02] No problem.
[00:07:18] OK, so there's a trick to telling incomplete vs. codominance apart
[00:08:00] Incomplete is literally the dominant and recessive genes are both expressed at the same time- you see this in animals with different color fur "patches"

Guest (Customer)
[00:08:44] ok

Kimberly B (Tutor)
[00:09:02] Codominance is more like finding an "inbetween" state
[00:09:17] Like paint being mixed and coming up with a third "inbetween" state
[00:09:49] So think of CO dominance as two phenotypes at the same time
[00:10:54] And incomplete means that you can have a mix phenotype when you have a heterozygote
[00:11:03] I put a pic up that illustrates the difference in some flowers
[00:11:10] Does that help or do you have questions?

Guest (Customer)
[00:11:49] well like how do if i tell what is by doing the punnett??

Kimberly B (Tutor)
[00:12:00] The punnett actually doesn't tell you
[00:12:10] The descriptions of the phenotypes tell you.
[00:12:23] For example, you are told there are 3 different color outcomes
[00:12:25] Black
[00:12:29] White
[00:12:32] or an inbetween gray

Guest (Customer)
[00:12:52] ok because this problem also asked if it was codominance or incomplete and i didnt know how to tell

Kimberly B (Tutor)
[00:13:09] The fact that it gave you three color options was the give away
[00:13:30] If it had said there were black mice, white mice, and patchwork mice that had both black and white fur, that would be codominance
[00:13:41] But the appearance of that 3rd color always means incomplete
[00:13:44] Does that help?
[00:14:04] The punnett is always just for sorting out the offspring genotypes.

Guest (Customer)
[00:14:58] yes thank you
[00:15:11] can you help me with something else

Kimberly B (Tutor)
[00:15:15] You're very welcome!
[00:15:45] We have time to take a look at something else for a few minutes- if you think you'll need more than 10 you might get more complete help with a new session.
[00:15:58] if you want to tell me your question I can help you decide, too.

Guest (Customer)
[00:16:12] i just need help understanding how to write phenotype and genotype ratios

Kimberly B (Tutor)
[00:16:26] OK, we can take a look at that.
[00:16:37] We can do that with you mouse problem here even...
[00:16:57] If thats ok with you?

Guest (Customer)
[00:17:03] yes

Kimberly B (Tutor)
[00:17:30] Ok, you said you were fine with doing the actual Punnett- does this look good to you?

Guest (Customer)
[00:17:45] yes

Kimberly B (Tutor)
[00:17:49] Great!
[00:17:56] I always start with genotype ratios
[00:18:04] How many times does Aa appear in the offspring?

Guest (Customer)
[00:18:38] 2

Kimberly B (Tutor)
[00:18:49] Out of how many boxes total?

Guest (Customer)
[00:18:52] 4

Kimberly B (Tutor)
[00:19:35] And then you can simplify that or write it a bit differently
[00:19:37] or as a percentage
[00:19:52] You see different notations depending on the use in genetics
[00:20:00] Ok so far?

Guest (Customer)
[00:20:40] yes

Kimberly B (Tutor)
[00:20:51] In this problem, because aa occurs just as often
[00:21:00] the ratio is the same
[00:21:13] So the offspring have a 1:2 or 50% change of being Aa
[00:21:20] or a 1:2 or 50% chance of being aa
[00:21:37] For the phenotype ratios... we just stop and quickly ask ourselves what each genotype looks like
[00:21:55] Aa = what color?
[00:22:01] And aa = what color?

Guest (Customer)
[00:22:09] Aa gray
[00:22:12] aa white

Kimberly B (Tutor)
[00:22:23] Excellent!
[00:22:29] Now you can set up the same ratios for phenotype
[00:22:40] 2/4 = 1/2 = 1:2 or 50% will be gray
[00:22:46] 1:2 or 50% will be white
[00:23:30] In regular Punnetts where heterozygotes (Aa) still have the dominant phenotype, the phenotype ratios will be different from the genotype ratios sometimes
[00:23:51] But a feature of incomplete dominance is that the genotype and phenotype ratios are the same because there's 3 possible genotypes and also 3 possible phenotypes
[00:24:01] Does that help?

Guest (Customer)
[00:24:15] yes thank you

Kimberly B (Tutor)
[00:24:25] You're welcome!
[00:24:38] This link is also helpful with more info on incomplete/codominance examples if you want some more help...

[00:24:47]
[00:24:56] Just FYI.

[00:24:57]

Guest (Customer)
[00:25:05] ok thanks so much

Kimberly B (Tutor)
[00:25:16] Thanks for visiting louisvuittonsac-pascher.info, today! If you have a sec, we appreciate any feedback you have on the survey.
[00:25:21] Have an awesome rest of your day!

[00:25:22]


Science - Biology occurred 1/28/2015 @ 8:25PM and lasted 25:31
codominance and incomplete dominance. A=black, a=white, Aa=gray. A gray mouse crossed with a white mouse.

SYSTEM (System)
[00:00:00]*** Please note: All sessions are recorded for quality control. ***
Guest (Customer)
[00:00:00]codominance and incomplete dominance. A=black, a=white, Aa=gray. A gray mouse crossed with a white mouse.
Kimberly B (Tutor)
[00:00:16]
Guest (Customer)
[00:00:24]hi
Kimberly B (Tutor)
[00:00:26]My name is Kim and I'm happy to help you with this problem.
[00:00:31]How are you today?
Guest (Customer)
[00:00:37]good how are you
Kimberly B (Tutor)
[00:01:05]I'm pretty good, thanks
Guest (Customer)
[00:01:46]im not sure how to put these into a cross and also im not sure how to tell if its codominance or imcomplete
Kimberly B (Tutor)
[00:02:06]LOL- just what I was going to ask you if you needed to pick one or the other.
[00:02:17]Let's start how to put into the cross, maybe?
Guest (Customer)
[00:02:22]ok
Kimberly B (Tutor)
[00:02:24]And then we can discuss co vs. incomplete
[00:02:39]Ok, so I take from the description that any A allele will give black or gray
Guest (Customer)
[00:02:44]i know how to cross i just don't know how to make a cross for these types of problems
Kimberly B (Tutor)
[00:02:48]so what must the white mouse genotype be?
[00:03:03]I figured that's what you meant- once we have the genotypes set, the Punnett is easy
[00:04:25]Any ideas about the genotype for the white mouse here, or is that mostly where you're stuck?
Guest (Customer)
[00:04:57]a
Kimberly B (Tutor)
[00:05:09]Right- must have the lower case (recessive) allele
[00:05:14]It needs two alelles though
[00:05:18]*alleles
Guest (Customer)
[00:05:22]aa??
Kimberly B (Tutor)
[00:05:25]That's right
[00:05:51]And the problem is clear about defining the gray mouse as Aa
[00:06:19]So that's your cross
[00:06:27]Did that help with your questions on that?
Guest (Customer)
[00:06:56]yes thank you
Kimberly B (Tutor)
[00:07:02]No problem. :)
[00:07:18]OK, so there's a trick to telling incomplete vs. codominance apart
[00:08:00]Incomplete is literally the dominant and recessive genes are both expressed at the same time- you see this in animals with different color fur "patches"
Guest (Customer)
[00:08:44]ok
Kimberly B (Tutor)
[00:09:02]Codominance is more like finding an "inbetween" state
[00:09:17]Like paint being mixed and coming up with a third "inbetween" state
[00:09:49]So think of CO dominance as two phenotypes at the same time
[00:10:54]And incomplete means that you can have a mix phenotype when you have a heterozygote
[00:11:03]I put a pic up that illustrates the difference in some flowers
[00:11:10]Does that help or do you have questions?
Guest (Customer)
[00:11:49]well like how do if i tell what is by doing the punnett??
Kimberly B (Tutor)
[00:12:00]The punnett actually doesn't tell you
[00:12:10]The descriptions of the phenotypes tell you.
[00:12:23]For example, you are told there are 3 different color outcomes
[00:12:25]Black
[00:12:29]White
[00:12:32]or an inbetween gray
Guest (Customer)
[00:12:52]ok because this problem also asked if it was codominance or incomplete and i didnt know how to tell
Kimberly B (Tutor)
[00:13:09]The fact that it gave you three color options was the give away
[00:13:30]If it had said there were black mice, white mice, and patchwork mice that had both black and white fur, that would be codominance
[00:13:41]But the appearance of that 3rd color always means incomplete
[00:13:44]Does that help?
[00:14:04]The punnett is always just for sorting out the offspring genotypes.
Guest (Customer)
[00:14:58]yes thank you
[00:15:11]can you help me with something else
Kimberly B (Tutor)
[00:15:15]You're very welcome!
[00:15:45]We have time to take a look at something else for a few minutes- if you think you'll need more than 10 you might get more complete help with a new session.
[00:15:58]if you want to tell me your question I can help you decide, too.
Guest (Customer)
[00:16:12]i just need help understanding how to write phenotype and genotype ratios
Kimberly B (Tutor)
[00:16:26]OK, we can take a look at that.
[00:16:37]We can do that with you mouse problem here even...
[00:16:57]If thats ok with you?
Guest (Customer)
[00:17:03]yes
Kimberly B (Tutor)
[00:17:30]Ok, you said you were fine with doing the actual Punnett- does this look good to you?
Guest (Customer)
[00:17:45]yes
Kimberly B (Tutor)
[00:17:49]Great!
[00:17:56]I always start with genotype ratios
[00:18:04]How many times does Aa appear in the offspring?
Guest (Customer)
[00:18:38]2
Kimberly B (Tutor)
[00:18:49]Out of how many boxes total?
Guest (Customer)
[00:18:52]4
Kimberly B (Tutor)
[00:19:35]And then you can simplify that or write it a bit differently
[00:19:37]or as a percentage
[00:19:52]You see different notations depending on the use in genetics
[00:20:00]Ok so far?
Guest (Customer)
[00:20:40]yes
Kimberly B (Tutor)
[00:20:51]In this problem, because aa occurs just as often
[00:21:00]the ratio is the same
[00:21:13]So the offspring have a 1:2 or 50% change of being Aa
[00:21:20]or a 1:2 or 50% chance of being aa
[00:21:37]For the phenotype ratios... we just stop and quickly ask ourselves what each genotype looks like
[00:21:55]Aa = what color?
[00:22:01]And aa = what color?
Guest (Customer)
[00:22:09]Aa gray
[00:22:12]aa white
Kimberly B (Tutor)
[00:22:23]Excellent!
[00:22:29]Now you can set up the same ratios for phenotype
[00:22:40]2/4 = 1/2 = 1:2 or 50% will be gray
[00:22:46]1:2 or 50% will be white
[00:23:30]In regular Punnetts where heterozygotes (Aa) still have the dominant phenotype, the phenotype ratios will be different from the genotype ratios sometimes
[00:23:51]But a feature of incomplete dominance is that the genotype and phenotype ratios are the same because there's 3 possible genotypes and also 3 possible phenotypes
[00:24:01]Does that help?
Guest (Customer)
[00:24:15]yes thank you
Kimberly B (Tutor)
[00:24:25]You're welcome!
[00:24:38]This link is also helpful with more info on incomplete/codominance examples if you want some more help...
[00:24:47]
[00:24:56]Just FYI.
[00:24:57]:)
Guest (Customer)
[00:25:05]ok thanks so much
Kimberly B (Tutor)
[00:25:16]Thanks for visiting louisvuittonsac-pascher.info, today! If you have a sec, we appreciate any feedback you have on the survey.
[00:25:21]Have an awesome rest of your day!
[00:25:22]:)
SYSTEM (System)
[00:25:32]*** Lost connection from Guest (Customer). Waiting for reconnect... ***

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