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Lesson 3 Genetic Crosses
Lesson 3
Genetic Crosses
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Slide 1:
Tekstslide
Biologie
Middelbare school
havo
Leerjaar 3,4
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Lesson 3
Genetic Crosses
Slide 1 - Tekstslide
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 - Tekstslide
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 - Tekstslide
What is the genotype of these tomatoes?
Red
We don't know
Round
Sweet
Slide 4 - Poll
Which of the following is not a trait?
A
Colour of eyes
B
Shape of leaves
C
Sweet taste
D
Taste
Slide 5 - Quizvraag
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 - Quizvraag
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 - Quizvraag
Homework question
Slide 8 - Tekstslide
Slide 9 - Tekstslide
Instruction
1. Predicting Outcomes of Genetic Crossings
2. Using test crosses to work out genotypes
Slide 10 - Tekstslide
1. Anwers question 2 a.
2. Answer quesiont 2b. ??????????????
Slide 11 - Tekstslide
1 Punnett Squares = predicating genetic crosses
Slide 12 - Tekstslide
Punnett squares - used to predict outcomes of crosses:
Slide 13 - Tekstslide
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 - Quizvraag
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 - Quizvraag
Gentypes: 50% Aa + 50% aa
Phenotypes: 1:1 (Aa:aa)
Slide 16 - Tekstslide
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 - Tekstslide
Example of a test cross with known homozygous recessive plant (zz)
Slide 18 - Tekstslide
Time to work!
1. Do question 2, 3 & 4 from your reader using punnett squares.
Slide 19 - Tekstslide
Let op!
Make sure you check your own work & take notes as we go through the answers.
Slide 20 - Tekstslide
Let op!
Make sure you check your own work & take notes as we go through the answers.
Slide 21 - Tekstslide
What have we learned this lesson?
Slide 22 - Tekstslide
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