DNA 2 - key terms

Question 1

What is a characteristic determined by?

Answer 1

• A characteristic can be determined by a single gene but is usually determined by the interaction of multiple different genes

Question 2

What is an allele?

Answer 2

• Different versions of the same gene
• Gene = eye colour
• Allele 1 = blue eyes
• Allele 2 = brown eyes

Question 3

How many alleles of each gene do we have?

Answer 3

• 2 (one maternal and one paternal)

Question 4

What is homozygous and hetrozygous?

Answer 4

• Homozygous: 2 of the same allele of 1 charateristic
• Hetrozygous: 2 different alleles of 1 charateristic

Question 5

What is a dominant and recessive allele?

Answer 5

• A dominant allele will always be expressed, no matter what the other allele is (homozygous or hetrozygous)
• A recessive allele will only be expressed when both alleles are the same (homozygous)W

Question 6

What is a genotype and phenotype?

Answer 6

• Genotype: collection of alleles we have
• Phenotype: the characteristic that is expressed by the genotype