CB3C Alleles

Question 1

What is a chromosome

Answer 1

A long, coiled molecule of DNA that carries genetic information in the form of genes

Question 2

Define gene

Answer 2

A section of DNA that codes for a specific sequence of amino acids which undergo polymerisation to form a protein

Question 3

What are alleles

Answer 3

Different versions of the same gene

Question 4

Define genotype

Answer 4

An organisms genetic composition describes all alleles

Question 5

Describe phenotype

Answer 5

An organisms observable characteristics due to interactions of the genotype and environment (which can modify the phenotype)

Question 6

Define homozygous

Answer 6

Having two identical alleles of a gene e.g FF or ff

Question 7

Define heterozygous

Answer 7

Having two different alleles of a gene e.g Ff

Question 8

What is a dominant allele

Answer 8

Describes an allele that is always expressed
Represented with a capital letter e.g F

Question 9

What is a recessive allele

Answer 9

An allele that is only expressed in the absence of a dominant allele
Represented with a small letter e.g f