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Lesson 3 Genetic Crosses
Lesson 3
Genetic Crosses
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Slide 1:
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Biologie
Middelbare school
havo
Leerjaar 3,4
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Lesson 3
Genetic Crosses
Slide 1 - Diapositive
Learning Goals:
You can explain what hereditary traits are.
You can explain what the difference is between phenotype and genotype.
You can explain how hereditary traits are transmitted to the following generation.
You can predict what the outcome of a genetic crossing will be.
Slide 2 - Diapositive
This Lesson:
1. Quiz - check concepts
2. Check homework question
3. Explanation Genetic crosses & punnett squares
4. Class work: quesions 2,3 & 4 from reader
This lesson is linked to the Lesson 3 Reader (Google Classroom).
Slide 3 - Diapositive
What is the genotype of these tomatoes?
Red
We don't know
Round
Sweet
Slide 4 - Sondage
Which of the following is not a trait?
A
Colour of eyes
B
Shape of leaves
C
Sweet taste
D
Taste
Slide 5 - Quiz
In pea plants small leaves are dominant over large leaves. Which of the genotypes will have large leaves?
A
Ff
B
ff
C
FF
D
fF
Slide 6 - Quiz
In pea plants small leaves are dominant over large leaves. Which of the genotypes will have small leaves?
A
Ff and FF
B
ff
C
FF & ff
D
Only FF
Slide 7 - Quiz
Homework question
Slide 8 - Diapositive
Slide 9 - Diapositive
Instruction
1. Predicting Outcomes of Genetic Crossings
2. Using test crosses to work out genotypes
Slide 10 - Diapositive
1. Anwers question 2 a.
2. Answer quesiont 2b. ??????????????
Slide 11 - Diapositive
1 Punnett Squares = predicating genetic crosses
Slide 12 - Diapositive
Punnett squares - used to predict outcomes of crosses:
Slide 13 - Diapositive
What is the % of genotypes in F1 in a cross of heterozygous dominant X homozygous recessive?
A
25% Aa + 75% aa
B
50% Aa + 25% aa
C
50% Aa + 50% aa
D
50% AA + 50% aa
Slide 14 - Quiz
What is the ratio of phenotypes in F1 in a cross of heterozygous dominant X homozygous recessive?
A
1:1
B
3:1
C
2:1
D
4:1
Slide 15 - Quiz
Gentypes: 50% Aa + 50% aa
Phenotypes: 1:1 (Aa:aa)
Slide 16 - Diapositive
2. Using a test cross to work out genotype
We want to use the small sweet tomatoes for our nieuw tomato variety:
- We know it's phenotype = sweet!
- But what is the genotype?
- Is genotype ZZ or Zz (sweet is dominant)?
How van we test which genotype a plant has? We do a test cross using a know phenotype = homozygous recessive.
Slide 17 - Diapositive
Example of a test cross with known homozygous recessive plant (zz)
Slide 18 - Diapositive
Time to work!
1. Do question 2, 3 & 4 from your reader using punnett squares.
Slide 19 - Diapositive
Let op!
Make sure you check your own work & take notes as we go through the answers.
Slide 20 - Diapositive
Let op!
Make sure you check your own work & take notes as we go through the answers.
Slide 21 - Diapositive
What have we learned this lesson?
Slide 22 - Diapositive
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