Sex Linked Inheritance

Question 1

X and Y chromosomes are NOT h_ _ _ _ _ _

Answer 1

X and Y chromosomes are NOT homologues

Question 2

The X chromosome is ____ than the Y chromosome

Answer 2

The X chromosome is longer than the Y chromosome

Question 3

Only genes found on _____ can cross over

Answer 3

Only genes found on both chromosomes can cross over

Question 4

Some genes found on the _ chromosome, although recessive, will express themselves in the presence of a _ chromosome given that the gene is not on the _ chromosome

Answer 4

Some genes found on the X chromosome, although recessive, will express themselves in the presence of a Y chromosome given that the gene is not on the Y chromosome

Eg. Haemophilia, red/green blindness

Question 5

Define Polygenic Inheritance

Answer 5

phenotypes that are controlled by different pairs of alleles (they are unlinked) where the different allele pairs have similar and additive effects on that trait. The genes can be referred to incompletely dominant.

Question 6

Examples of polygenetic Inheritance

Answer 6

Skin colour. This results in a range of possible pigmentation