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3t chapter 7.4 monohybrid crosses
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Slide 1:
Tekstslide
Biologie
Middelbare school
vwo
Leerjaar 3
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41 slides
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tekstslides
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Slide 1 - Tekstslide
Exercise 1
A father has brown eyes. He is heterozygous for eye colour. Mother has blue eyes. The gene for brown eyes is dominant.
a. Is mother homozygous or heterozygous for eye colour?
b. Two children are born. Child 1 has brown eyes and child 2 has blue eyes. Show this in a cross. Use the letters B and b
Slide 2 - Tekstslide
P
P
genotype
phenotype
F1
sex cells
possibilities for F1:
Slide 3 - Tekstslide
Father has
brown
eyes.
Slide 4 - Tekstslide
P
P
genotype:
phenotype:
F1
sex cells:
brown eyes
possibilities for F1:
Slide 5 - Tekstslide
Mother has
blue
eyes.
Slide 6 - Tekstslide
P
P
genotype:
phenotype:
F1
sex cells:
brown eyes
blue eyes
possibilities for F1:
Slide 7 - Tekstslide
A father has brown eyes. He is
heterozygous
for eye colour. Mother has blue eyes. The gene for brown eyes is
dominant
.
Slide 8 - Tekstslide
Slide 9 - Tekstslide
gene is eye colour
2 alleles, they can be:
brown - brown =
homo
zygous
blue - blue =
homo
zygous
brown - blue =
hetero
zygous
brown is dominant: B
blue is recessive: b
brown - brown: notation = BB
blue - blue: notation = bb
brown - blue: notation = Bb
B
b
Slide 10 - Tekstslide
What means homozygous?
A
a chromosome pair with two equal alleles: AA and aa
B
a chromosome pair with two equal alleles: Aa
C
a chromosome pair with two different alleles: AA and aa
D
a chromosome pair with two different alleles: Aa
Slide 11 - Quizvraag
What means heterozygous?
A
a chromosome pair with two equal alleles: AA and aa
B
a chromosome pair with two equal alleles: Aa
C
a chromosome pair with two different alleles: Aa
D
a chromosome pair with two different alleles: AA and aa
Slide 12 - Quizvraag
A father has brown eyes. He is
heterozygous
for eye colour. Mother has blue eyes. The gene for brown eyes is
dominant
.
How do you notate the genotypes of father and mother?
Slide 13 - Tekstslide
Father has brown eyes. He is heterozygous for eye colour. Mother has blue eyes. The gene for brown eyes is dominant.
How do you notate the genotypes of father and mother?
A
father BB, mother Bb
B
father Bb, mother BB
C
father BB, mother bb
D
father Bb, mother bb
Slide 14 - Quizvraag
P
P
genotype:
phenotype:
F1
sex cells:
brown eyes
blue eyes
bb Bb
possibilities for F1:
Slide 15 - Tekstslide
A father has brown eyes. He is heterozygous for eye colour. Mother has blue eyes. The gene for brown eyes is dominant.
a. Is mother homozygous or heterozygous for eye colour?
Slide 16 - Tekstslide
Is mother homozygous or heterozygous for eye colour?
A
homozygous
B
heterozygous
Slide 17 - Quizvraag
P
P
genotype:
phenotype:
F1
sex cells:
brown eyes
blue eyes
bb Bb
possibilities for F1:
And now the sex cells are made...
Slide 18 - Tekstslide
Sex cells are made by meiosis.
What happens during meiosis?
One answer is NOT correct. Which one?
A
a diploid (2n) cell divides into 4 haploid (n) cells
B
chromosome pairs are pulled apart into different cells
C
a diploid (2n) cell divides into 2 diploid cells (2n)
D
After meiosis there are 4 sperm cells and 2 egg cells made.
Slide 19 - Quizvraag
P
P
genotype:
phenotype:
F1
sex cells:
brown eyes
blue eyes
bb Bb
b
b
b
B
possibilities for F1:
Slide 20 - Tekstslide
P
P
genotype:
phenotype:
F1
sex cells:
brown eyes
blue eyes
bb Bb
b
b
b
B
possibilities for F1:
What eye colour do the children (F1) have?
Slide 21 - Tekstslide
P
P
genotype:
phenotype:
F1
sex cells:
B
b
b
b
brown eyes
blue eyes
bb Bb
b
b
b
B
possibilities for F1:
spermcells
egg cells
Slide 22 - Tekstslide
P
P
genotype:
phenotype:
F1
sex cells:
B
b
b
Bb
b
brown eyes
blue eyes
bb Bb
b
b
b
B
possibilities for F1:
Slide 23 - Tekstslide
P
P
genotype:
phenotype:
F1
sex cells:
B
b
b
Bb
bb
b
brown eyes
blue eyes
bb Bb
b
b
b
B
possibilities for F1:
Slide 24 - Tekstslide
P
P
genotype:
phenotype:
F1
sex cells:
B
b
b
Bb
bb
b
Bb
brown eyes
blue eyes
bb Bb
b
b
b
B
possibilities for F1:
Slide 25 - Tekstslide
P
P
genotype:
phenotype:
F1
sex cells:
B
b
b
Bb
bb
b
Bb
bb
brown eyes
blue eyes
bb Bb
b
b
b
B
possibilities for F1:
Slide 26 - Tekstslide
P
P
genotype:
phenotype:
F1
sex cells:
B
b
b
Bb
bb
b
Bb
bb
brown eyes
blue eyes
bb Bb
b
b
b
B
genotype
2x Bb (50%)
2x bb (50%)
possibilities for F1:
Slide 27 - Tekstslide
P
P
genotype:
phenotype:
F1
sex cells:
B
b
b
Bb
bb
b
Bb
bb
brown eyes
blue eyes
bb Bb
b
b
b
B
genotype
2x Bb (50%)
2x bb (50%)
phenotype
brown eyes
blue eyes
possibilities for F1:
Slide 28 - Tekstslide
Exercise 1
A father has
brown
eyes. He is
heterozygous
for eye colour. Mother has
blue
eyes. The gene for
brown eyes is dominant
.
a. Is mother homozygous or heterozygous for eye colour?
Mother is
homozygous
: she has
bb
b. Two children are born. Child 1 has brown eyes and child 2 has blue eyes. Show this in a cross. Use the letters B and b
Done
.
Slide 29 - Tekstslide
P
P
genotype
phenotype
F1
sex cells
possibilities for F1:
Slide 30 - Tekstslide
Slide 31 - Tekstslide
Slide 32 - Tekstslide
Slide 33 - Tekstslide
Slide 34 - Tekstslide
Slide 35 - Tekstslide
Slide 36 - Tekstslide
Slide 37 - Tekstslide
Slide 38 - Tekstslide
Slide 39 - Tekstslide
Slide 40 - Tekstslide
Slide 41 - Tekstslide
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