Genes

Question 1

What’s a gene

Answer 1

Short sequence of nucleotides that provides the code for a polypeptide

Question 2

What’s an allele

Where are they found

Answer 2

If gene exists in 2/more forms

Found on chromosomes

Question 3

How are chromosomes formed from chromatin

Answer 3

DNA double helix condenses

Question 4

How can dna condense

Answer 4

Coils around histones proteins

Question 5

What’s the locus

Answer 5

Specific alleles position on the chromosome

Question 6

What are the chromosomes in in diploid nuclei

Answer 6

Homologous pairs (same locus)

Question 7

What’s codominance

Answer 7

When both alleles may be dominant in equal measures, instead of 1 dominant and 1 recessive at the locus

Question 8

How does codominance create a mixture of alleles

E.g

Answer 8

As both alleles would be expressed as a phenotype

E.g human blood type - controlled by A,B + O alleles

Question 9

What are monohybrid crosses

What do they show

Answer 9

GCSE crosses

Show how 1 single gene is inherited