1. Tutorial #1 by Ma’ayan Fishelson Changes made by Anna Tzemach Basic Concepts in Genetics

8. One Locus Inheritance heterozygote homozygote 2 1 A | A a | a A | a 3 4 a | a A | a 5 6 a | a Male Female

9. Mendel’s 1 st Law Two members of a gene pair segregate from each other into the gametes, so half the gametes carry one member of the pair and the other half carry the other member of the pair. Y / y y / y ½ y/y ½ Y/y ½ y ½ Y all y Gamete production Gamete production

11. X-linked Inheritance Different results obtained from reciprocal crosses between red-eyed and white-eyed Drosophila. Explanation : The gene responsible for eye-color is X-linked . Females have 2 X-chromosomes, while males have 1 X-chromosome and 1 Y-chromosome.

22. Question #2-Solution Highlights P – the normal allele p – the mutant allele P/p P/p P/p P/p p/p p/p P/- P/-