DNA and Genetics - Chapter 4

1 / 30
next
Slide 1: Slide
BiologieMiddelbare schoolvwoLeerjaar 3

This lesson contains 30 slides, with interactive quizzes, text slides and 1 video.

time-iconLesson duration is: 45 min

Items in this lesson

Slide 1 - Slide

Genes, alleles, loci and chromosomes
A gene encodes a protein. These proteins will result in having certain (hereditary) traits. 

Every gene is located on a fixed spot on the genome. This spot is called a locus (pleural: loci).

Each gene might have different variants. A gene variant is called an allele.
Because a diploid organism has two copies of each chromosome (homologous), this organism will have two loci of each genes. These may carry the same or different alleles. 

Slide 2 - Slide

Slide 3 - Slide

2

Slide 4 - Video

01:20
What is the differences between a dominant and a recessive allele?

Slide 5 - Open question

02:07
How do we call a genotype with 2x the same allele?

Slide 6 - Open question

Slide 7 - Slide

Slide 8 - Slide

Slide 9 - Slide

Slide 10 - Slide

Slide 11 - Slide

Slide 12 - Slide

Black fur(B) in guinea pigs is dominant over white fur(b). Find the probability of heterozygous offspring in the cross: BB x Bb.

Slide 13 - Open question

Black fur(B) in guinea pigs is dominant over white fur(b). Find the probability of a white offspring in a cross: Bb x bb

Slide 14 - Open question

Slide 15 - Slide

A chicken with white feathers is crossed with a rooster with black feathers. The gray offspring in F1 are crossbred.

Which phenotypes are found in the F2?

Slide 16 - Open question

A woman with blue eyes has a child with brown eyes. The allele for B brown eyes is dominant over the allele for B blue eyes. What genotype (s) could the father have had?

Slide 17 - Open question

In cats, the gene for a spotted coat (R) is dominant over that for an unspotted coat (r). A female with spotted fur gives birth to a male with spotted fur. Among the young are animals with a spotted coat and animals with an unspotted coat. What are the genotypes of the parent animals?

Slide 18 - Open question

What are the genotypes of these heterozygous guinea pigs?

Slide 19 - Open question

What percentage is Hh?
A
25%
B
50%
C
75%

Slide 20 - Quiz

What percentage of these guinea pigs have hair?
A
25%
B
50%
C
75%
D
100%

Slide 21 - Quiz

1. A heterozygous dog with a dominant black fur (B) reproduces with a homozygous dog with white fur. What is the genotype of the white dog?

Slide 22 - Open question

3. A heterozygous dog with a dominant black fur (B) reproduces with a homozygous dog with white fur. What are the genotype percentages?

Slide 23 - Open question

2. A heterozygous dog with a dominant black fur (B) reproduces with a homozygous dog with white fur. What are the sex cells going to be?

Slide 24 - Open question

What is the genotypic ratio?

Slide 25 - Open question

Two parents are heterozygous for brown eyecolor. What is the chance of getting a child with blue eyes?
A
0%
B
25%
C
50%
D
100%

Slide 26 - Quiz

What are the phenotypic percentages of the offspring?

Slide 27 - Open question

Jule's and jacob's dad has blue eyes. Mom has brown eyes. Jule herself has blue eyes. How high is the chance for Jacob having brown eyes?
A
0%
B
25%
C
50%
D
100%

Slide 28 - Quiz

Stambomen
Pedigrees (Family trees)  

  • Show how certain traits are inherited
  • Circle: woman
  • Square: man

Slide 29 - Slide

Write down the genotypes of the guinea pigs (white fur = recessive)

Slide 30 - Slide