Genetics

3. are thread-like structure that are made up of a long molecule of DNA
9. a genetic cross between parents that have different alleles for one particular gene
12. different form of the same gene
17. Physical appearance of an organism
18. Inheritance that produce a heterozygote with a phenotype that is intermediate or in between the phenotypes of the homozygote parent
20. allele that is masked by the presence of a dominant allele and can only appear phenotypically if homozygous

1. number of chromosomes in the cell (46n)
2. Occurs when the contribution of both alleles are visible in phenotype
4. individual has different alleles for a particular gene
5. position of a gene on a chromosome
6. Physical appearance of an organism
7. section of DNA that contains the information for a particular genetic characteristics
8. variation - complete range of characteristics from one extreme to another
10. Genetic make –up of an organism
11. Refers to the difference in characteristics between individual of the same species
13. process of choosing individual with desirable characteristics in order breed offspring that may inherit their desire characteristics
14. reappearance of an ancestral characteristics after it has apparently not come to light for few generation
15. transfer of characteristics(such as height, colour)from parent to their offspring
16. diagram used to work out how gametes can combine in a genetic cross
19. one or more nucleotide based are removed from the gene sequence