Y10 Genetics

2. Cell division that produces two identical daughter cells (growth and repair).
4. Having two identical alleles for a particular gene.
5. Different versions of the same gene. For example, a gene for eye color might have alleles for blue eyes or brown eyes.
8. The process by which traits are passed from parents to offspring.
10. The molecule described as a double helix structure containing the code for building and operating a living being.
13. A specific characteristic of an organism (e.g. eye colour, height)
14. The genetic makeup of an organism, specifically the combination of alleles it possesses for a particular gene.
15. An allele that is expressed in both homozygous and heterozygous conditions.Nucleotide The building block of DNA, consisting of a sugar, phosphate, and base.
16. An allele that is only expressed when in the homozygous condition.Zygote The fertilized egg, formed when a sperm cell and an egg cell combine.

1. A thread-like structure of DNA that carries genes. Humans have 23 pairs of chromosomes.
3. Having two different alleles for a particular gene.
6. A change in the DNA sequence.
7. The observable characteristics of an organism, resulting from the interaction of its genotype with the environment.
9. The passing of traits from parents to offspring.
11. A specific sequence of DNA that determines a particular trait.
12. Reproductive cells (sperm and egg) that carry only one allele for each gene.