Modes of inheritance

Question 1

Define sex linkage inheritance

Answer 1

Sex - linkage
Refers to alleles that are found on sex chromosomes which determines a particular trait.
Recessive characteristics are usually found on female carriers
A female carrier for a recessive gene is not expressed but can be passed on.

Question 2

Outline all of the non mendelian crosses

Answer 2

Incomplete dominance.
Co-dominance.
Sex linkage.
Multiple alleles.

Question 3

What does Mendal state?

Answer 3

hereditary elements are passed on in discrete units rather than “blended” together at each new generation

Question 4

Define Incomplete dominance inheritance

Answer 4

Incomplete dominance
When both dominant alleles are expressed at the same time resulting in BLENDED characteristics
Eg, pink roses (both colours are mixed) red + white are dominant

Question 5

Define Multiple alleles inheritance

Answer 5

Multiple alleles
When a gene has 3 or more alleles
Eg, blood types - 4 blood type AB, A, B, O(recessive)

Question 6

Define Codominance inheritance

Answer 6

Codominance
When alleles are both expressed as they are both dominant
For eg, roan cows that shows red and white spots

Question 7

Define Autosomal inhertance

Answer 7

Autosomal
Having to do with any of the 22 numbered pairs of chromosomes found in most human cells.