Monohybrid crosses + pedigree charts video's

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Slide 1: Tekstslide
BiologieMiddelbare schoolvwoLeerjaar 4

In deze les zitten 27 slides, met interactieve quizzen, tekstslides en 2 videos.

Onderdelen in deze les

Slide 1 - Tekstslide

Slide 2 - Video

Study the image

What is true?

This organism is...
A
homozygous for the left gene heterozygous for the middle gene heterozygous for the right gen
B
heterozygous for the left gene heterozygous for the middle gene homozygous for the right gene
C
homozygous for the left gene homozygous for the middle gene heterozygous for the right gene
D
homozygous for the left gene heterozygous for the middle gene homozygous for the right gene

Slide 3 - Quizvraag

If your ear lobe is attached to your head or not is a hereditary trait that is monogenetic. It is caused by one single gene. The allele for loose lobes is dominant.

What gametes will a heterozygous father produce?

A
100% of his spermcells are Aa
B
50% of his sperm cells are A 50% of his sperm cells are a
C
75% of his sperm celles are A 25% of his sperm cells are a
D
100% of his sperm cells are a

Slide 4 - Quizvraag

Slide 5 - Tekstslide

Kitty is a long-haired female cat and has mated with Kobus. In her litter we find both long-haired kittens and short-haired kittens. The allele for long hair is recessive

Give the genotypes of both parents, show a punnett square of the cross and explain the expected phenotype ratio in the offspring. Complete this on paper, take a picture and upload here.

Slide 6 - Open vraag

In cattle, the allele for a rough tongue is dominant over the allele for a smooth tongue. A cow is heterozygous for the gene. This cow has a calf with a bull that is also heterozygous for this gene.

What is the chance this calf is also heterozygous for this gene? Explain your answer by drawing a punnett square on paper, taking a picture and uploading that here.

Slide 7 - Open vraag

In guinea pigs the allele for rough hair is dominant over smooth hair. A rough-haired heterozygous female has a litter. The offspring are all rough-haired. It is unknown who is the father. There are three options:
Male 1: smooth-haired
Male 2: rough-haired (homozygote)
Male 3: rough-haired (heterozygote)
Organise the males from most likely to be the father to least likely.

Slide 8 - Open vraag

With newborn babies they extract a bit of blood to get tested. A child is tested and they find it has a metabolic abnormality called PKU. The child will have to follow a special diet. Neither of the parents shows symptoms of this disease. The parents would like to have another child. What is the chance their second child will also have PKU?
A
12,5%
B
25%
C
50%
D
100%

Slide 9 - Quizvraag

A rose breeder performs a cross. In this species of rose there are two phenotypes with regard to leave edges. A plant with serrated edges is crossed with a plant with smooth edges. All offspring have leaves with serrated edges. Explain the phenotype of the offspring.

Slide 10 - Open vraag

The same rose breeder has a plant with serrated edges, but he doesn't know if it is heterozygote or homozygote. He uses a cross to figure it out. Based on the phenotype of the other parent plant and the phenotypes of the offspring he can determine the genotype of his original parent plant. What should be the genotype of the other parent plant to determine the genotype of the original plant? Write down a punnett square, take a picture and upload here.

Slide 11 - Open vraag

Slide 12 - Tekstslide

Slide 13 - Tekstslide

Why do you think that Huntington’s disease is still around (1 in 20.000 people) whereas other dominantly inherited diseases are not that common?

Slide 14 - Open vraag

A man who gets Huntington’s disease at the age of 40 had two children with a woman who doesn’t have it. He had himself tested and he turns out to be a heterozygote. What is the chance both his children will get it? Explain by using Punnett squares.

Slide 15 - Open vraag

Slide 16 - Tekstslide

Slide 17 - Tekstslide

A man who is a carrier of cystic fibrosis wants to have a child with a woman whose parents are carriers of cystic fibrosis. She doesn’t know if she is a carrier. What is the chance that the child will get cystic fibrosis? Is it advisable to get herself tested?

Slide 18 - Open vraag

Slide 19 - Video

pedigrees
Healthy male

Healthy female

Male/female with genetic abnormality

Slide 20 - Tekstslide

Is this condition dominant or recessive?
A
dominant
B
recessive

Slide 21 - Quizvraag

True or false:

Person 2 is heterozygous
A
true
B
false

Slide 22 - Quizvraag

True or false

You can't tell what the genotype of person 5 is.
A
true
B
false

Slide 23 - Quizvraag

True or false:

The chance of person 8 being heterozygous is 25%

A
true
B
false

Slide 24 - Quizvraag

True or false:

Person 7 must be heterozygous

A
true
B
false

Slide 25 - Quizvraag

For persons 12 and 13 it is yet unknown if they have the disease or not.

Calculate the chance of person 12 having the disease.

Slide 26 - Open vraag

Slide 27 - Tekstslide