Example punnet square for sex-linked recessive trait | High school biology | Khan Academy
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- Опубліковано 2 тра 2018
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Example punnet square for sex-linked recessive trait.
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Thank you so much!!! My teacher makes things super murky and unclear with his 20 side tangents, had no clue it was this easy!
This makes the test I have to take tomorrow feel like a walk on the park. THANK YOU!!🙏🏿
Yess it was a lot useful!! Thanks for this good explanation...🤗
i bet everyone watching has a test the next day and don't understand anything
karim Ebeid I have a test today🤣
no haha i’m doing my online school and idk what i’m doing
HAHAHA I have a test tom
that's not me and I don't have a test 😅😅 im just revising
fax
thank u that was so helpful as a college student where teachers expect u to know this stuff w/o explaining it. Appreciate it!!
Very good explanation! I was able to understand it! Thank You!
Amazing explanation, thank you good sir.
THANKS FOR MAKING IT SO SIMPLE TO UNDERSTAND
So well explained!!!
Well explained!!
i studied it in my zoology book. i'm from Bangladesh.
thank you
Thank you Sir. It is very helpful. I have a query, at 4:13 it should be "50% chance for having non-Hemophiliac son"? Please clarify
Yes it should be 50%, given that they have a son. Sounds like a small oversight. Have to be careful, it depends on how the question is asked- given that they have a son OR given from all offspring (daughter & sons) Later @ 4:32 they ask about given that they have a son- what is chance they don't have hemo.? It's 50% - so non hemo is 50% as well.
About Studies the chance of having a son with haemophilia is 25% as a whole (because it is also including the probability of having a daughter). If it asked what would be the chance that any son they had inherited haemophilia, then it would be 50%.
agree with you, I am also confusing until I saw your comment
Very helpful I was busy sunrising for biology
IN GOD NAME I WILL PERFECT MY THIRD EXAMINATION🎉🎉🎉
sir, how about writing the genotypic and phenotypic ratio of that offspring using the problem you used in this video? please help me, I'm so confused about writing it.
I'm confused whether writing the genotypic and phenotypic ratio is to write is based on gender or writing it as whole. Hope you help me with this concern. Thanks
it depends what the question is asking
Thank you I understand now
Thanks
25% I am so confused? for the daughter he said 50% because there is only two possible ways to get but why for male is 25%?
its out of all offspring possibilities
The question is asking about daughter . So ignore the male part . So 2 daughter = 2:2 . 1 daughter =1:2 which is 50 percent
Ahhh. “If they have a daughter (50 %) what are the chances she will have hemophilia” 1/2
Compared to
What are the chances they will have a hemophiliac son. (25% out of total) 1/4. Tricky wording
the chance of having a son with haemophilia is 25% as a whole (because it is also including the probability of having a daughter). If it asked what would be the chance that any son they had inherited haemophilia, then it would be 50%. ctto
Wow thanks for the help :)
Very positive comment aborted_ fish d!ck.
My bacon is saved. Gonna load it now.
its vary good but i am engineering student so
so?
ok
Hey can I ask? Does this also apply to Color Blindness? (c = colorblind, C = Normal)
Yes it does
❤❤
you had reported that it was a 50% chance of having hemophilia as a daughter, but the Hh for the daughter is heterozygous non disorder/ only carrier.. So she doesn't actually have it. Her children could. That being said the percentage to answer the question the way its worded, "Percentage that she will HAVE hemophilia", that is actually only 1:4. Because for recessive disorders you have to have both recessive allele's to have the disorder. similarly, in the x-linked recessive case, the girls have the second X chromosome that work as a back up so to say. She wouldn't actually have the disease.
The question said IF they had a DAUGHTER. Out of the FOUR scenarios there are two. Two daughters only. We disregard the other two scenarios because they have a Y chromosome which makes them male. So OF the TWO scenarios we have - X(H)X(h) and X(h)X(h) only ONE of them will have haemophilia. The second one will. Because she has two Xh chromosomes. The first one will only be a carrier.
epic
Who is phenotypically normal?
The individuals who do not have hemophilia. Even if they are a carrier, they are still phenotypically normal because it is not expressed in their phenotype
hi can i ask... what if its animals? Lets say male birds are ZZ and female birds are ZW. And barred feathers are (ZB) while non-barred feathers(Zb)... then if ill make a punnett square between barred female and a non barred male chicken, how do i cross them? Hope you'll notice...
I think you're looking to far into it. If the birds are still female and male, females would still be XX and males would still by XY. This does not change since it's specifically sex-linked traits
Why 25% ?
Help
(1/4)*100=25
because it's out of all offspring, not just the sons
Can you do this one “A family that lives in Kentucky has a rare genetic disorder; some of the family members have blue
skin. Normal skin color (N) is dominant to blue skin (n) color. A woman and man who have normal
skin color produce a child with blue skin.”
Ты русский?
thank you