You can understand and write out the difference between a heterozygous and homozygous genotype using gene symbols.
You can explain the impact of combinations of dominant and recessive alleles on the phenotype.
You can make predictions about possible genotypes that can arise in offspring when you know the genotypes of the parents.
You can make predictions about possible phenotypes resulting from the resulting genotypes.
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Slide 1: Slide
BiologieMiddelbare schoolhavo, vwoLeerjaar 2
This lesson contains 18 slides, with interactive quizzes, text slides and 1 video.
Lesson duration is: 45 min
Items in this lesson
B8 Dominant and recessive
Take off your jacket
Put your things on your desk
Book, notebook, pencil case
Bag on the floor
Read pages 162-163
timer
4:00
Lessongoals
You can understand and write out the difference between a heterozygous and homozygous genotype using gene symbols.
You can explain the impact of combinations of dominant and recessive alleles on the phenotype.
You can make predictions about possible genotypes that can arise in offspring when you know the genotypes of the parents.
You can make predictions about possible phenotypes resulting from the resulting genotypes.
Slide 1 - Slide
Wheel of homework
Go to Lessonup.app and use this code
Reward
Penalty
Slide 2 - Slide
What is the best description of genes and alleles?
A
A gene is in the DNA
An allele is on a chromosome
B
a gene is a characteristic
an allele is a variant of this characteristic
C
allele and gene are synonymous
D
an allele is a characteristic
a gene is a variant of this characteristic
Slide 3 - Quiz
Give an example of a gene
Slide 4 - Open question
Healthy organisms always have 2 alleles of each gene. Explain why these alleles aren't always the same.
Slide 5 - Open question
Homo- & heterozygous
Homo = same hetero = different
Homozygous > both alleles for the characteristic are the same
Heterozygous > alleles of the characteristic are different
Slide 6 - Slide
Dominant and recessive
Alleles are either dominant or recessive
Dominant is 'stronger' than recessive
A dominant trait means dominant for all members of the species
Heterozygous genotype > Dominant allele visible in phenotype
Slide 7 - Slide
Flowers of the bean plant can be pink or white. Plant 1 has white flowers and is heterozygous. Plant 2 has pink flowers and is homozygous. Which colour is recessive?
A
White
B
Pink
C
Impossible to know
Slide 8 - Quiz
Cats can have black or red fur colour. Black is dominant. What are possible genotypes for a black cat?
A
Always homozygous
B
Always heterozygous
C
Homozygous or heterozygous
Slide 9 - Quiz
Cats can have black or red fur colour. Black is dominant. What are possible genotypes for a red cat?
A
Always homozygous
B
Always heterozygous
C
Homozygous or heterozygous
Slide 10 - Quiz
Gene symbols
Alleles are usually shown using a letter.
Alleles of the same gene use the same letter
Dominant = capital letter, Recessive = normal letter
AA = homozygous dominant
aa = homozygous recessive
Aa = heterozygous
Slide 11 - Slide
For humans, red hair is dominant over blond hair. A man is heterozygous for hair colour. What is his geno- and phenotype?
A
AA and red hair
B
aa and blond hair
C
Aa and red hair
D
Aa and blond hair
Slide 12 - Quiz
A father has genotype AA, the mother Aa. Which genotypes are possible for their kids?
A
AA, aa en Aa
B
Aa en aa
C
Aa en AA
D
aa en AA
Slide 13 - Quiz
What you should do:
Read pages 162-163
Do asgmt 1-3 pgs. 163-165
Challenge: how it fits together pgs. 156-157, pgs 145-146 can help
Done with the above?
Work on the next chapter(s)
Learn for the test
Make other homework
Read a book
Zs = Working in Silence
No asking questions
Silent, don't disturb anyone
Stay at your desk
timer
6:00
Slide 14 - Slide
What you should do:
Read pages 162-163
Do asgmt 1-3 pgs. 163-165
Challenge: how it fits together pgs. 156-157, pgs 145-146 can help