4.1.5 Inheritance

Question 1

What is codominance

Answer 1

Where both alleles of heterozygous individuals are fully expressed (combinations of two alleles) eg. brown cows+ white cows= spotty cows (all letters are capital letters)

Question 2

What is the difference between a dominant allele and a recessive allele

Answer 2

A dominant capital letter= dominant allele lowercase letter= recessive allele

Question 3

What is the difference and definition of genotypes and phenotypes

Answer 3

Genotypes are the variations of the gene (which allele is expressed) Phenotypes are the physical trait of what the gene would look like *Gene is a trait to code and an allele is he variations that gene could be e.g. gene = eye colour allele= blue eyes

Question 4

Predict the phenotypes and genotypes of this punnet square

Answer 4

Genotype: 50% Yy (heterozygous), 50% yy (homozygous)

Phenotype: 50% of offspring will be yellow, 50% will be green

*Do practice worksheets for punnet squares on elearn*

Question 5

What is polygenic Inheritence

Answer 5

It is when more than one gene determines the phenotype (many alleles ocntrol the phenotype)

-the environment can also influence this

E.g. eye, skin, hair colour

Question 6

Understand how frequency histograms can be used to predict the phenotype outcomes of an individual.

Answer 6

Just know it.

Powerpoint 4.1.5 Inheritance

Question 7

What are sex linked inheritance and the notation for it?

Answer 7

Genes that are present in specific genders

XY for father (we dont write anything on the Y)

and XX for mother

Question 8

What is an example for a sex (X) linked gene

Answer 8

Colourblindness and Hemophilia is more common in men as they only have one X gene for the allele to present

e.g.

X^cY