MELANIN QUIZ

What is melanin?

• A protein pigment that absorbs light

• A protein that is waterproof and tough

• A cell found in the epidermis

• A vitamin that helps you sleep

Mutations are sometimes helpful and increase the chances of survival in a particular environment.

• true

• false

A change in a gene, group of genes or chromosome that results in a change in the proteins

• Replication

• Mutation

• Translation

• Transcription

Albinism is a recessive condition in which an individual produces little to no pigment. The dominant trait is to have normal coloring.

What's the genotype for albinism?

• aa

• AA or Aa

• Albino

• Aa

A man and woman both have freckles and they are both heterozygous for the trait.

Do they express the dominant or recessive trait?

• Dominant

• Recessive

What is a genotype?

• Two of the same alleles
• The two alleles (letters) that represent a gene
• The trait that is ALWAYS seen
• A trait that can be physically seen

What is a phenotype?

• An organism with two of the same alleles for a gene
• The two alleles (letters) that represent a gene
• The form of a gene that is never seen
• A trait that can be physically seen

The pedigree shows the recessive trait for albinism in a family. How many boys are afected by Albinismo? (Normal=N, Albinism=n)

• 2
• 3
• 4
• 5

What would indicate a human male?

• XX
• X
• XY
• XXY

How many pairs of homologous chromosomes are found in each (body) cell of a human?

• 46

• 23

• 72

• 10