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Description:
AP Biology 1.2 Essential Life Process Information. What is likely the genotype of the parents of this family?
Transcript
- 00:00
Thank you We sneak and here's your shmoop du jour
- 00:05
brought to you by dominant genetic traits The bullies of
- 00:09
dna high school a three to one few notification E
- 00:14
o is seen in a large family when looking at
- 00:16
the inheritance of a widow's peak or a dominant trait
Full Transcript
- 00:20
called w what is the likely gino type of the
- 00:24
parents of this family on here The pension Well gina
- 00:32
type determines fino type right That means the combination of
- 00:35
dominant and recessive genes determines how an organism looks well
- 00:38
Let's go through each possible genotype of mom and dad
- 00:41
to find out which one gives junior or junior et
- 00:43
a seventy five percent chance of having a widow's peak
- 00:46
This thing first up option a big big dubbed by
- 00:52
big big depth well that's both parents having two dominant
- 00:55
genes for this trait Well as you can see this
- 00:58
would lead to all big w's and afford a zero
- 01:01
fino typical ratio I one hundred percent of their kids
- 01:04
will have widow's peaks Unless of course they take matters
- 01:07
into their own hands Okay next up answer Be big
- 01:10
Big dubbed by little that little dub one parent has
- 01:13
two dominant genes The other has to recess it well
- 01:16
Different results on the last one but still a four
- 01:18
to zero fina typical ratio If there's even one big
- 01:22
w present in the fina type that means you're in
- 01:24
the widow's peak club Very exclusive All right let's try
- 01:28
See Big dead little dubbed by little little Nope This
- 01:32
gives their offspring a fifty fifty chance kind Of like
- 01:35
flipping a genetic coin yes okay last won The correct
- 01:39
answer is d big dud little dubbed by big doubled
- 01:41
up ah three to one ratio is the hallmark of
- 01:44
a mano hybrid One dominant one recess If cross if
- 01:48
both of your parents have a widow's peak and share
- 01:51
this type of genome there's a seventy five percent chance
- 01:54
or three to one that you or your brothers or
- 01:57
sisters have won so d it is want to learn
- 02:01
way more about widow's peaks Well good for you to
- 02:03
do a google search for widow's peak It's that simple
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