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Which row describes the sperm cell and the egg cell before fertilisation? Place a cross (X) in the box next to your answer - Edexcel - GCSE Biology - Question 2 - 2015 - Paper 1
Question 2
Which row describes the sperm cell and the egg cell before fertilisation? Place a cross (X) in the box next to your answer. | sperm cell | egg cell | |------------|... show full transcript
Worked Solution & Example Answer:Which row describes the sperm cell and the egg cell before fertilisation? Place a cross (X) in the box next to your answer - Edexcel - GCSE Biology - Question 2 - 2015 - Paper 1
Step 1
Which row describes the sperm cell and the egg cell before fertilisation?
Answer
The correct answer is D: haploid for both the sperm cell and the egg cell. This is because sperm and egg cells are gametes, which contain half the genetic material (haploid) as compared to somatic cells (diploid).
Step 2
Describe the structure of DNA.
Answer
DNA is a double helix structure. The sides of DNA are made from alternating sugars and phosphate molecules, forming a sugar-phosphate backbone. There are paired/complementary bases; adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G). These bases are joined by hydrogen bonds between the strands.