Biology: Sex chromosomes/inherited

determines whether the offsprings are male or female.

non-sex chromosomes

X-linked and Y-linked genes together

expressed in the presenece of sex hormones and are only observed in one sex or the other.

expressed in both sexes, but are expressed differently.

ex: baldness

variation of a particular inherited character

study of heredity

• -Incomplete Dominance
• -Codominance

Both alleles are partially expressed.

example: Blending

Shows a phenotype that is a mixture of both parents. Both alleles are shown.

example: roan cows.

• many genes.
• 1 trait

example: height, eye color, skin color, weight.

• gene 1: TONE of pigment
• gene 2: AMOUNT of pigment
• gene 3: POSITION of the pigment

• 1 gene
• affecting multiple traits

example: sickle cell disease