8.1 3 Mendelian genetics and beyond

Question 1

Why did Mendel investigate peas

Answer 1

Colour of peas
Shape of peas
Pods of peas
Height of peas Varys in clear cut way

Easy to grow
Could control pollination

Question 2

Mendel’s first law

Answer 2

Law of segregation

“One allele for each trait is inherited from each parent to give a total of two alleles for each trait “

Segregation occurs when gametes formed

Question 3

Mendels second law

Answer 3

The law of independent assortment

“Different traits are inherited independently of each other”

Has exceptions due to gene linkage and polygeneic inheritance

Question 4

What are multiple alleles features

Answer 4

More than two possible variants at a particular locus

No matter how many there are an individual will only inherit two

Question 5

Codominant

Answer 5

Both alleles are expressed and proteins act together without mixing to produce a given phenotype

Question 6

Human ABO blood group

Answer 6

I^O
I^A
I^B 
Code for presence of antigens on surface of erythrocytes 
O is not antigens 
A B and codominant