Genetic terms

Question 1

Genes

Answer 1

A sequence of bases on a DNA molecule that codes for a protein which results in a characteristic

Question 2

Alleles

Answer 2

A different version of the same gene

Question 3

Locus/Loci

Answer 3

The fixed position that the allele of each gene is found on each chromosome in a pair

Question 4

Genotype

Answer 4

The genetic constitution of an organism

Question 5

Phenotype

Answer 5

The expression of the genetic constitution and its interaction with the environment

Question 6

Dominant alleles

Answer 6

Always expressed in phenotype, even if there is only one copy

SHOWN BY CAPITAL LETTERS

Question 7

Recessive alleles

Answer 7

Only expressed if there are two copies present

shown by lower case letters

Question 8

Codominant alleles

Answer 8

Some alleles are both expressed in the phenotype because neither one is recessive

Question 9

Homozygous

Answer 9

An organism carries two copies of the same allele

Question 10

Heterozygous

Answer 10

An organism carries two different alleles for a gene