1. A homozygous organism with two recessive alleles
Starter for
Place the statements in order
One card with 1 meaning
Linked to a word on another
DNA
Reproductive (sex) cell that fuses with another of the same type of cell during fertilisation
Gamete
A homozygous organism with two recessive alleles

2. Higher Human Biology Unit 1 – Human Cells DNA

3. Learning Outcomes Content Explain the term genotype.
Describe what the DNA molecule is made up from and how it is bonded.
Process
Model making!
Benefit
Understand how inheritance is carried out.
Explain how CSI DNA works!
P12
The genotype of a cell is determined by the sequence of bases in its DNA.
DNA is the molecule of inheritance and can direct its own replication.
Structure of a DNA nucleotide (deoxyribose sugar, phosphate and base). Nucleotides bond to form a sugar–phosphate backbone. Base pairs (adenine, thymine and guanine, cytosine,) held by weak hydrogen bonds forming a double helix. Double stranded antiparallel structure with deoxyribose and phosphate at 3' and 5' ends of each strand.

4. New Information
The genotype (genetic makeup of an organism) of a cell is determined by the sequence of bases in its DNA.
DNA is the molecule of inheritance and can direct its own replication.
Made up of nucleotides.

5. DNA Nucleotide
Structure of a DNA nucleotide (deoxyribose sugar, phosphate and base). O
O=P-O
Phosphate
Group N
Nitrogenous base
(A, G, C, or T)
CH2 O C1 C4 C3 C2 5
Sugar
(deoxyribose)
Pentose

6. DNA Nucleotide
Structure of a DNA nucleotide (deoxyribose sugar, phosphate and base). O
O=P-O
Phosphate
Group
My house (sugar), a garage (base) and a satellite dish (phosphate group) N
Nitrogenous base
(A, G, C, or T)
CH2 O C1 C4 C3 C2 5
Sugar
(deoxyribose)
Pentose

7. DNA Backbone Nucleotides bond to form a sugar–phosphate backbone.
Base pairs (adenine, thymine and guanine, cytosine,) held by weak hydrogen bonds forming a double helix.
Double stranded antiparallel structure with deoxyribose and phosphate at 3' and 5' ends of each strand.

8. Sugar-phosphate backbone
Nucleotides bond to form a sugar–phosphate backbone.
Covalently bonded (strong bond)at position 3 and 5 carbon.

9. DNA 4 Bases ..... 2 purines (double garage; double ringed structure)
2 pyrimidines (single garage; single ringed structure)
Complementary base pairing due to hydrogen bonding
A + T have 2 bonds
C + G have 3 bonds
ary

11. New Information
The genotype of a cell is determined by the sequence of bases in its DNA.
DNA is the molecule of inheritance and can direct its own replication.
Structure of a DNA nucleotide (deoxyribose sugar, phosphate and base). Nucleotides bond to form a sugar–phosphate backbone. Base pairs (adenine, thymine and guanine, cytosine,) held by weak hydrogen bonds forming a double helix. Double stranded antiparallel structure with deoxyribose and phosphate at 3' and 5' ends of each strand.

12. DNA Double Helix P O 1 2 3 4 5 P O 1 2 3 4 5 G C T A

13. Activity Research one of these AMAZING scientists
Make your own model of DNA!
- Newcastle

14. Review Comment on each others DNA model; Positives comments
Improvements that could be made