outcome 4.1

Question 1

describe Incomplete dominance

Answer 1

The two versions (alleles) of the same gene are not expressed as dominant or recessive; rather, the expressed trait is a combination of both alleles.

Question 2

describe Codominance

Answer 2

Two versions (alleles) of the same gene are expressed separately. One trait is not dominant over the other and so both traits appear.

Question 3

describe Sex linked traits

Answer 3

X and Y are sex chromosomes. XX = female,XY = male. Sex linked traits are carried on the sex chromosomes. X or Y. Y linked traits –very rare -it is a very small chromosome for making male species , oh and hairy ears. X linked traits can be dominant or recessive.

Question 4

describe Polygenic inheritance

Answer 4

The inheritance of traits that are determined by more than one gene. These genes, called polygenes, produce specific traits when they are expressed together.

Question 5

describe Multiple allele

Answer 5

Typically, there are only twoalleles for a gene. Multiple alleletraits have more than two possible alleles. You wouldstill only have two copies of each gene, one from each parent, but there will be a range of possible alleles within the population. e.g. blood type

Question 6

provide an example of co-dominance

Answer 6

A White (WW) horse and a Brown horse (BB) could produce offspring that expresses both white and brown separately at the same time (BW).

Question 7

provide an example of incomplete dominance

Answer 7

A Brown (BB) rabbit and a white (WW) rabbit could produce a Light brown offspring (BW).

Question 8

provide and example of multiple alleles

Answer 8

A good example is blood type in dogs, in which there are three alleles: iA, iB or i. As a result, a person can be iAiB, iAi, iBi, or ii.