DNA and Genetics - Chapter 4

• Biologie
• Middelbare school
• vwo
• Leerjaar 3

T

Allele

Dominant

Genotype

Heterozygote

Homozygote

Recessive

Phenotype

Same gene: different forms

Two of the same genes

The weaker allele

Appearance

Two different alleles

The stronger allele

Genetic constitution: the alleles that you have

Grab your notebook and write this down

Monohybrid crossings

01:20

What is the differences between a dominant and a recessive allele?

02:07

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

03:42

What are the genotypes of these heterozygous guinea pigs?

04:37

What percentage is Hh?

1. 25%
2. 50%
3. 75%

05:37

What percentage of these guinea pigs have hair?

1. 25%
2. 50%
3. 75%
4. 100%

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

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

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?

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?

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?

Answer question 1:

Answer question 2

Answers questions 3 + 4

Homework

Make chapter 4