Biology Canadian DAT Biology Notes-1 PDF

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Biology Canadian DAT Biology...

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Pedigree Cheat-Sheet You may encounter a pedigree question on the Canadian DAT. In the case you do, there are certain tricks you can memorize to help you solve these questions faster. Autosomal Dominance -All aected individuals MUSThave at least one aected parent -If two parents are unaected, all ospring MUSTbe unaected (homozygous recessive) -If two parents are aected, theymayhave ospring who are unaected (if parents are heterozygous) Autosomal Recessive -If two parents show a trait, all children MUSTalso show the trait (homozygous recessive) -An aected individualmayhave two normal parents (if parents are both heterozygous carriers) X-Linked Dominance -If a male shows a trait, so MUSTall daughters as well as his mother -The disorder is more common in females -It is not possible to conclusively conrm sex-linkage frompedigreecharts X-Linked Recessive -If a female shows the trait, so MUSTall sons as well as her father -The disorder is more common in males -It is not possible to conclusively conrm sex-linkage frompedigreecharts 

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Pedigree Cheat-Sheet You may encounter a pedigree question on the Canadian DAT. In the case you do, there are certain tricks you can memorize to help you solve these questions faster. Autosomal Dominance -All aected individuals MUSThave at least one aected parent -If two parents are unaected, all ospring MUSTbe unaected (homozygous recessive) -If two parents are aected, theymayhave ospring who are unaected (if parents are heterozygous) Autosomal Recessive -If two parents show a trait, all children MUSTalso show the trait (homozygous recessive) -An aected individualmayhave two normal parents (if parents are both heterozygous carriers) X-Linked Dominance -If a male shows a trait, so MUSTall daughters as well as his mother -The disorder is more common in females -It is not possible to conclusively conrm sex-linkage frompedigreecharts X-Linked Recessive -If a female shows the trait, so MUSTall sons as well as her father -The disorder is more common in males -It is not possible to conclusively conrm sex-linkage frompedigreecharts 

Pedigree Examples...