S3 Bio 1.2 Revision

What is the correct order?

• chromosome, gene, DNA, nucleus

• nucleus, chromosome DNA gene

• DNA, gene, chromosome, nucleus

• DNA, chromosome, gene, nucleus

What is a gene?

• protein

• section of DNA

• chromosome

The genetic code in the DNA is made up of b_____

The base pair rule in DNA is

• A-G

  C-T

• A-C

  G-T

• A-T

  G-C

Complete the following using the base -pair rule

AATCGAT

We inherit our DNA from our p______

Work out the following genetic cross

T - tall, t- dwarf

a Tall plant (Tt) is crossed with a dwarf plant (tt)

The potential types of offspring produced are:

• Tt and TT

• Tt and tt

• TT and tt

• TT, Tt and tt

The Jones family are carriers of cystic fibrosis - C is normal gene and c is disease gene. What letters will represent carrier parents?

• CC

• cc

• Cc

The Sinclair family suffer from Haemophilia - their blood cannot clot.

H - normal gene; h- disease gene

Dad is Hh and mum is hh. Predict the % chance that the offspring will have this disease

• 25%

• 75%

• 50%

Describe the structure of DNA..

• single stranded and straight

• double stranded helix

• single stranded helix