Punnit square?

can someone please do a punnet square for eye and hair color for two kids please

mother = blond = green eyes

father = brown hair = blue eyes

our first child has blond hair blue eyes.

i just forget how to do the punit square. i would just like a general idea of what it could be.

Punnit square?

Punnet square is really irrlevant in humans due to co-dominance of genes; penetrance, expresivity, ontogenetic modification, etc. Dark-haired people can have blond blue-eyed kids: in your case all i caould say is that yr husband has a gene for blond hair and mother a gene for blue eyes

Punnit square?

Try this site. It's hard to do one though, if you don't really know the recessive. Blue eyes are always recessive, so you know they're bb. Green eyes can be Gb or bg. You know there is a b donated to the green eyed child because that's all the blue eye'd parent has to donate, but you also know that the green eyed parent HAS a blue gene, because the blue eyed child got it...otherwise, they'd have green eyes because green dominates blue.

Punnit square?

it could really be blond hair blue eyes, brown hair green eyes, the same as either of you, or even another color of eyes and hair... you wouldn't know w/o knowing the recessive genes

Punnit square?

basically, the regular punnet square is a box with four spaces in it:

___________________

l l l

l l l

l l l

l_________l_________l

l l l

l l l

l l l

l_________l_________l

when you want to find out something about the offspring, like the hair and eye color, you can use the punnet square to figure it out. For example, you would need two different squares for the eyes and the hair. The eye punnet square would look like this:

g g

___________________

l l l

l l l

b l bg l bg l

l_________l_________l

l l l

l bg l bg l

b l l l

l_________l_________l

Because the blue and green eye traits are recessive (lowercase) and not dominant (capital) both of the parents carry the recessive trait, and do not carry dominant. so, the kid would have either blue or green eyes. neither of the colors are dominant over the other, so the kid has a fifty fifty chance of blue or green eyes.

The Punnett square shows every possible combination when combining one maternal allele with one paternal allele. In this example, both organisms have the genotype Bb. They can produce gametes (kids/fertilized eggs) that contain either the B or b alleles. (It is conventional in genetics to use capital letters to indicate dominant alleles and lower-case letters to indicate recessive alleles.) The probablility of an individual offspring having the genotype BB is 25%, Bb is 50%, and bb is 25%.

B b

___________________

l l l

l l l

B l BB l Bb l

l_________l_________l

l l l

l l l

b l Bb l bb l

l_________l_________l

It is important to note that Punnett squares only give probabilities for genotypes (the makeup of it), not phenotypes (they physical characteristics). The way in which the B and b alleles interact with each other to affect the appearance of the offspring depends on how the gene products (proteins) interact (see Mendelian inheritance). For classical dominant/recessive genes, like that which determines whether a rat has black hair (B) or white hair (b), the dominant allele will mask the recessive one. Thus in the example above 75% of the offspring will be black (BB or Bb) while only 25% will be white (bb). The ratio of the phenotypes is 3:1, typical for a monohybrid cross.

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LOOK HERE, THERE IS SOMETHING IMPORTANT @@@@@@ !!!!!!!!!!!!!!!!!!!??????????

if you need more help/ a punnett square calculator, go here:

http://www.changbioscience.com/genetics/...

Punnit square?

father ( brown hair + blue eyes)

mother ( blond + green eyes)

R= brown hair

r= blonde

Y = blue eyes

y= green eyes

possible gametes

R r

Y YR Yr

y yR yr

YR Yr yR yr

YR YYRR YYrR yYRR yYrR

Yr YYRr *YYrr* yYRr yYrr

yR YyRR YyrR yyRR yyrR

yr YyRr Yyrr yyRr yyrr

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