Linked Genes and Offspring Distribution

[@GauravYadav-qj8is]

Complete and crisp content in a minimum time limit possible. Incredible.

[@nadjetnadjet4616]

شكرا على فيديوهاتك استفدت منها كثيرا في دراستي الجامعية 🌷🌷🌷

[@jaredshope1122]

How in the world did he get the % numbers. This is the most important part and it remained unexplained

[@jassitandon4592]

probably experimental determined

[@SajidAli-zm8fc]

Sir really nice lecture probably the first lecture series on KZbin with complete discription. Sir as our English is not so strong please make speed a bit slow

[@itishreesahoo5642]

sir can u increase the volume of ur vedio

[@kittiesstan0]

hello sir how did u know that it was 40% for non recombinants and 10% for recombinants?

[@ecekupcu4831]

I think that is just the observed or given ratio for the gametes, that have undergone crossing-overs.

[@inyoungpark5616]

greatly appreciate these videos.

[@devilboii96]

Hi AK Lectures, first of all, I really love all and appreciate all your videos! It made my learning in bio so much easier. I just have a question. @2:51, Did you assume that the chromosome would have a 'G' and a 'T' together? Is it possible for the chromosome to have a 'G' and a 't'? Because if the second is the case, the phenotype would still be the same, a tall and green plant right?

[@nicotean8376]

yes

[@samuelfaulkner754]

In this video you are comparing crossing over with the 1:1:1:1 ratio of unlinked genes which I don't think makes sense to try and connect. It would be more simple to explain that in linked genes the gametes will have a 1:1 ratio. So linked GTgt homologous chromosomes would be expected to produce 50%GT and 50%gt gametes but it was observed that the ratio didn't fit this mold and thus crossing over was why. Is that explanation correct?

[@jassitandon4592]

It is said that there's a 1:1:1:1 ratio because there are 4 gametes formed at the end of meiosis and each of a different kind. So it means there's a 1:1:1:1 ratio of each of the 4 types of gametes formed (when the genes are not linked). This ratio is altered when the genes are linked (frequency of parental type combinations increase due to linkage) and becomes 0.4:0.1:0.1:0.4 for the 4 possible kinds of gametes formed at the end of meiosis.

[@riyasharma-rr3ji]

Hi sir. how you have taken out the percentage recombination?

[@jamesa6397]

Hey there, loving the videos. Just a quick question, how did you arrive at 10% recombination frequency? In another video, you explained it is dependant on the distance between the two genes, which isn't known in this case. Thanks for the great content

[@akoryachko]

In case genes stay at the same chromosome after recombination, and if we assume 1/2 probability of this event no matter how distant gene loci are in the DNA, we would actually have 8 combinations, i.e. the 4 from the video and GT gt GT gt. 100% divided by 8 combinations gives 12.5% which were rounded to 10% in this video. So 10% comes from the rounding and an assumption on equal probability of genes to stay on the same chromosome after recombination. It is not precise, but good enough to have an idea on trait distribution.

[@crocketmeow]

I think you can also use the fact that 50 % is the maximum recombination frequency on 1 chromosome. Because there are 4 possible phenotypes, you can divide 50% by 4. 50%/4 = 12.5 % and he rounded this down to 10% for simplicity. Then, to find the parental percentages, he did 100% (total) - (12.5 x 2) = 75%, which he rounded to 80% Then, each parental combination/phenotype had an expected 75%/2 = 37.5% distribution. He rounded this to 40% for each. The rest of the explanation Alexandir has.

[@gianydennisespinoza5108]

I LOVE YOU for asking this question! I rewatched that part like 10 times and saw you had the same question, god blesss youu

[@desavathkushal1377]

How the recombinant become 10 % only ?this remain unexplained

[@goldenboy886]

Thanks

[@SadiqunhnabiChoudhury]

I thought you got a 9:3:3:1 ratio?

[@jassitandon4592]

that's the phenotypic ratio of the progeny not the ratio of the types of gametes formed

[@ZezimaTruth]

Ehh