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T. T. Tt. GENETICS. t. t. PUNNETT SQUARE. EXPECTATION. Make predictions about possible outcomes of various genetic combinations of inherited characteristics. PUNNETT SQUARE RULES. PARENT’S GENES.

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GENETICS

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Genetics

T

T

Tt

GENETICS

t

t

PUNNETT SQUARE


Expectation

EXPECTATION

Make predictions about possible outcomes of various genetic combinations of inherited characteristics.


Punnett square rules

PUNNETT SQUARE RULES

PARENT’SGENES

A Punnett square is a tool used to predict the possible genotypes for the offspring of two known parents.

PARENT’S GENES


Vocabulary

VOCABULARY


Punnett square

PUNNETT SQUARE

  • The parent’s alleles go on the OUTSIDE of the square.

R

R

RR X rr

r

r


How to use a punnett square

HOW TO USE A PUNNETT SQUARE

1. The parent’s alleles go on the OUTSIDE of the square.

2. DROP the letters on the top into each square.

R

R

r

Rr

Rr

NOTE: The ORDER DOES NOT matter in the boxes, but uppercase first is a good rule.

r

3. MOVE each letter on the side into each square.

Rr

Rr


How to use a punnett square1

HOW TO USE A PUNNETT SQUARE

WHAT DO THE RESULTS SHOW?

RESULTS:

B

B

If B is the DOMINANTallele for BLACK.

PHENOTYPIC:

100% BLACK

4:0 RATIO, BLACK TO BROWN

b

Bb

Bb

And b is the RECESSIVE allele for BROWN.

GENOTYPIC:

100% Bb

4:0 ALL Bb

b

Bb

Bb

Then, we can make predictions about the outcomes.


How to use a punnett square2

HOW TO USE A PUNNETT SQUARE

LET’S LOOK AT ANOTHER PUNNETT SQUARE AND PREDICT THE OUTCOME.

WHAT ARE THE RESULTS?

T

t

PHENOTYPIC:

75% TALL

25% SHORT

3 : 1 RATIO: TALL TO SHORT

Tt

T is the DOMINANTallele for tallness.

TT

T

t is the RECESSIVE allele for shortness.

GENOTYPIC:

1TT: 2Tt: 1tt 1:2:1 RATIO

25 %TT, 50% Tt, 25% tt

t

tt

Tt


Punnett square practice

PUNNETT SQUARE PRACTICE

Complete Punnett Square:

  • Yellow is dominant (Y).

  • Green is recessive (y).

  • Father - yy

  • Mother - Yy

  • Identify the phenotype and genotype.

SeedColor


Punnett squares

PUNNETT SQUARES

Set up the square.

Complete PunnettSquare: SeedColor

  • Yellow is dominant (Y).

  • Green is recessive (y).

  • Father - yy

  • Mother - Yy

  • Phenotype –

  • Genotype –


Punnett squares key

PUNNETT SQUARES KEY

Complete Punnett Square: SeedColor

  • Yellow is dominant (Y).

  • Green is recessive (y).

  • Father - yy

  • Mother - Yy

  • Phenotype - 50% Yellow

    and 50% green

    f. Genotype - 50% Yy and 50% yy

y

Y

y

yy

Yy

y

yy

Yy


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