4-7Question of the Day

Remember the following for pea pod color G = green and g = yellow

You cross a yellow w/ a green and get 101 greens + 0 yellows, what genotype was the P generation green (GG or Gg)? EXPLAIN!

Monohybrid Cross Practice

T = tall t = short Cross the following true breeding plants: tall X

short.

What is the genotype ratio? What is the phenotype ratio?

TT X tt T T

t t

Tt Tt

Tt Tt

Review

a. Complete dominance

b. Incomplete dominance

c. Codominance

If a true breeding red flower crossed with a true breeding blue flower to produce all purple flowers these flowers are an example of…

4-8Question of the Day

For pea plants: Purple flower color is dominant over white flower color

You cross a purple w/ a white if you get a white baby plant, you know the purple parent plant genotype was what? EXPLAIN!P = purple allele and p = white allele

Question of the Day

White parent = Purple parent =

pp PP or Pp

P ?p p

Pp ?p

Pp ?p

4-8

Dog ActivityTODAY

Question of the Day1. If gold = dominant + white =

recessive + you cross 2 white fish, what will you get?

2. What can you tell about the genotype of a true-breeding plant? Explain.

4-11

Review

Gg X GG

G gG G

GG Gg

GG Gg

gold = dominant + white = recessive Cross a heterozygous gold fish with a

homozygous gold fish.

What are the phenotypic ratios?What are the genotypic ratios?

All gold

½ GG and ½ Gg

Review

a. Complete dominance

b. Incomplete dominance

c. Codominance

If a true breeding red flower crossed with a true breeding blue flower to produce red flowers with blue spots these flowers are an example of…

4-8Yesterday’s Packet HAND IT IN!!!

Dog Activity hand in when finished – due Monday 4-11

Assignment

My.hrw.com

Chapter 9

Username = dhe5n

Password = p5e8n

4-11ANNOUNCEMENT

Quest (larger than a quiz, smaller than a test) Unit 7 will be on Thursday 4-14 – goal setting applies

Dihybrid Cross

Dihybrid Cross – when you make a cross for two

traitsExample:

Traits = pod color AND plant height

Cross: Tall, Yellow Plant x Short, Green Plant

Dihybrid Cross

Dihybrid Cross – when you make a cross for two

traitsExample:

Traits = Cross:

Dihybrid Cross PracticeT = tall t = short W = white w = purple Cross a heterozygous tall, white plant with

another heterozygous tall, white plant.

What is the phenotypic ratio? _______________ What is the genotypic ratio? ________________

TtWw X TtWwTW Tw tW tw

TWTwtWtw

TTWW TTWw TtWW TtWw

TTWw TTww TtWw Ttww

TtWW TtWw ttWW ttWw

TtWw Ttww ttWw ttww

Dihybrid Cross PracticeT = tall t = short W = white w = purple Cross a short, purple plant with a homozygous

tall, heterozygous white plant

What is the phenotypic ratio? _______________

ttww X TTWwtw tw tw tw

TWTwTWTw

TtWw TtWw TtWw TtWw

Ttww Ttww Ttww Ttww

TtWw TtWw TtWw TtWw

Ttww Ttww Ttww Ttww

Dihybrid Cross Practice

T = tall t = short W = white w = purple Cross a short, purple plant with a homozygous

tall, homozygous white plant

What is the phenotypic ratio? _______________

ttww X TTWW