How do you construct a punnett square?

Answer 1

Use put you symbol like BB at the top of the 4 section square and on the other side u put your other symbol like Bb at combine them like u do on a multiplication table. But rember the dominant allels are always first. for example B at top left corner but b on top left side, well even though u always go with the left side first the Capital is first ethier way like insteaed of bB it must go Bb.

Answer 2

Take the phenotypes of the two parents and have them above and next to a box:

(say that the mother is AA and the father is Aa)

....A A

A AA AA

a Aa Aa

Genotypic ratio: 2 homozygous dominant: 2 heterozygous: 0 homozygous recessive

Treat it like a multiplication table. Take the allele from the top and the allele from the side to get two alleles in each box. (If the dominant allele is present, have it be first)

Answer 3

If it is a monohybrid cross, then just make a 2x2 square and put the mom and dad's genes on the left (one set) and one the top (other set) and put the things together. If it is a dihybrid cross, then make a 4x4 square and and put all the possible genes of each parent on one side and another on the top and do the same as the monohybrid.

Answer 4

This is a monohybrid cross: draw a Punnett square.

Be sure to remember that the capital letter is dominant.

A green pea plant (GG) is being crossed with a green pea plant (Gg) with yellow as the recessive color.

G G

GG

GG

Gg

Gg

g

G

Phenotype (what is seen)=

4 Green pea plants: 0 yellow pea plant

Genotype (what is in the genes) =

2 GG & 2 Gg

All plants will be seen as green.

Answer 5

So you take a phenotype, for example: If a cat's eyes are green or blue

green is dominant so it can either be (genotype) Capitol, Capitol or Capitol, lowercase(we'll use the letter "e" to represent "eye color").

Blue is a recessive trait so it is (genotype) lowercase, lowercase, or "ee"

so if one parent is heterozygous and the other is homozygous recessive the punnet square would be

R r

------------

r | Rr | rr |

r | Rr | rr | < Genotypes

------------

So the kitten(s) would have a 50% chance of green eyes and a 50% chance of blue

Answer 6

First, you take the letters (in this i will use Gg and gg) Gg and place them at the top of the square G g

then you place gg lengthwise down the square g Gg gg

g Gg gg

then you bring down the top letter and place the small letter after it the big letter always goes first to make it easier to read) then you do the same thing for each little square (bringing it down or across)

Hope this helps

Answer 7

-draw a square

-draw a line down the middle of the square

-draw a line through the middle of the square

Ta Da you got a punnett square!