Pedigree Analysis 2: How to solve a genetic pedigree. Example No. 2

Biology teacher Andrew Douch, looks at another pedigree, and explains some of the more subtle aspects of pedigree analysis.

Category:

Education

Tags:

• pedigree
• genetic
• genetics
• punett
• punnett
• punnet
• inheritance
• mendelian
• analysis
• douch
• douchy
• biology

[huntingbirdtv]

thank you for this explanation, but we don't have 10 minutes to spend on a single question in an exam situation.

[andrewdouch]

@huntingbirdtv That's true of course. But I doubt you would need to take anything like 10 minutes. It takes much longer to explain a technique than it does to use it. With a bit of practice, you should be able to follow the process in about two minutes.

[andrewdouch]

Ricebabi3 - not skipping a generation doesn't necessarily prove that a trait is dominant, (unlike skipping a generation - which does prove it to be recessive). But not skipping a generation does suggest that it's statistically likely to be dominant.

[crapi4got]

i wish you were my biology teacher

[thecoolestone15]

helpt alot thx vm

[al2275]

don't you HATE when the missus invades the man cave AND just hovers?!

[al2275]

ooh! What did you do?Looks like wifey came home & saw the mess you left from your pow-wow with the mates & you DIDN'T tidy up.

[al2275]

ooh! What did you do?Looks like wifey came home & saw the mess you left from your pow-wow with the mates & you DIDN'T tidy up. Don't you hate when they invade?

[Catalaayaa]

think i got it now though thanx!

[Catalaayaa]

why do all teachers tend to speak fast when they say something really important :(

[Catalaayaa]

so the sons only gets the allele from the mother?? dont get 3.23 :S

[TheMrMarMar13]

Thank you very much, you explained this better than my teacher

[magoshagolago]

Thanks! It was worth ten minutes to watch this...i didn't understand this up until now..

[bananasofcourse]

@pinoks1 She has to be aa to be recessive (Aa and AA is dominant). The reason she has to be recessive is because the circle is not shaded, which means she is not affected. Every time the circle or square is shaded, that means the person is affected. The reason recessive refers to being unaffected is because the screencaster, specifically at 4:00, was assuming the affected person is Dominant/Autosomal Dominant.