Random Fertilisation & Genetic Variation
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11 Terms
Random fertilisation
Any sperm can fuse with any egg, producing unique offspring
Genetic variation
Differences between individuals due to different allele combinations
Gamete
Haploid sex cell (sperm or egg)
Zygote
Fertilised egg formed after gamete fusion
Meiosis
Produces genetically different gametes
Alleles
Different versions of a gene
What is random fertilisation?
The random fusion of any sperm with any egg
How does random fertilisation create variation?
Each zygote gets a unique mix of alleles
Why are gametes genetically different?
Meiosis produces gametes with different allele combinations
What is a zygote?
A fertilised egg cell formed after gamete fusion
Give an example of genetic variation in humans
Blood group, eye colour, tongue‑rolling ability
