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Have I understood this punnet square question ?

Genetics as it applies to evolution, molecular biology, and medical aspects.

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Have I understood this punnet square question ?

Postby girlslovebarbie » Sat Feb 01, 2014 2:55 pm

A plant with genotype SsYy is crossed with a plant with genotype ssYy. S (spherical seeds) and Y (yellow seeds) are dominant over s (wrinkled seeds) and y (green seeds), respectively. The genes for pea colour and shape are on different chromosomes and therefore inherited independently. Using a Punnett square, predict all the possible F1 genotypes. ( please imagine them in a square)

SY
Sy
sY
sy

sY
SsYY
SsYY
ssYY
ssYy

sy
SsYy
Ssyy
ssYy
ssyy *

sY
SsYY
SsYy
ssYY
ssYy

sy
SsYy
Ssyy
ssYy
ssyy *



How many of the resulting genotypes have a phenotype with wrinkly green seeds?

AM i RIGHT IN SAYING THERE WOULD BE 2 WITH WRINKLY GREEN SEEDS i'VE PUT A STAR by the two i believe to show this i BELIEVE SHOW THIS
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Postby JackBean » Thu Feb 06, 2014 12:55 pm

Two of how many? You should show your result as percentage.

The second plant can make only sY and sy gametes, so it doesn't make sense to use it twice in the square.
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
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