"Mendelian genetics and inheritance": HTML5 Crossword

Across

3. Cross involving parents differing in only one trait (10,5)
4. A trait expressed preferentially over another trait (8,5)
7. A trait that is masked by the dominant trait (9,5)
8. Alleles segregate from one another during the formation of gametes (3,2,11)
11. A locus on any chromosome but a sex chromosome (9)
14. The pair of chromosomes in a diploid individual that have the same overall genetic content (10,11)
16. The different forms of a gene (7)
17. Change in the sequence of DNA (8)
18. The genetic make-up of an organism with respect to a trait (8)
19. The physical appearance or expression of an organism's genotype (9)
20. One gene masks the expression of a different gene for a different trait (9)

Down

1. Alleles of different genes are assorted independently of one another during the formation of gametes (3,2,11,10)
2. Genes that are inherited together on the same chromosome (7)
5. heterozygous; usually referring to the offspring of two true-breeding individuals differing in the traits of interest (6)
6. Intermediate phenotype in F1 (red and white=pink), parental phenotypes reappear in F2 (10,9)
9. Differing alleles for a trait in an individual, such as Yy (12)
10. A single gene determines more than one phenotype for an organism (11)
12. Both alleles for a trait are the same in an individual (10)
13. Mutated genes that are capable of causing death (6,7)
15. Sex determination is based on these (0,3,11)