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This type of genetic disorder requires both parents to “donate” a defective gene.

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Presentation on theme: "This type of genetic disorder requires both parents to “donate” a defective gene."— Presentation transcript:

1 This type of genetic disorder requires both parents to “donate” a defective gene

2 Autosomal recessive (2 little letters: aa, bb, ff) found on 1 of the first 22 chromosomes

3 What is it called when an offspring is heterozygous for a recessive genetic disorder?

4 A carrier (Dd, Hh, Aa)

5 There are no carriers for these fatal diseases. If you have one copy of this gene then you HAVE the disease

6 Autosomal Dominant

7 Give an example of 1 autosomal dominant disease

8 1- Huntington’s Chorea - like Parkinson’s where physical and mental abilities deteriorate 2 - Marfan’s syndrome – Lincoln was thought to have this (very tall – usually die of heart problems)

9 the most common genetic disorder among black people. Red blood cells are abnormally shaped

10 Sickle cell anemia

11 This genetic disorder is seen in all races of people and animals where pigment (color) is missing

12 Albinism

13 X-linked genetic disorders are carried on the X chromosome

14 Sex linked genetic disorder

15 With sex linked genetic disorders, why is it that boys are mostly affected?

16 Girls have XX so if 1 X is damaged, the other chromosome dominates BUT boys have XY so if the X is damaged, the Y cannot compensate

17 Who is the carrier for sex linked disorders?

18 Women are carriers of the disease – They DO NOT have it, but with each pregnancy they have a 50-50 chance of passing it on to their sons – those sons are NOT carriers

19 Give 1 example of a sex linked disorder

20 hemophilia (The Royal Disease of Europe), color blindness, Duchenne’s Muscular Dystrophy and Adrenoleukodystrophy (ALD)

21 the most commonly inherited genetic disorder among Caucasian people. It produces a great deal of phlegm build up.

22 Cystic fibrosis

23 The universal blood donor

24 Type O

25 Aside from taking blood, where else can your blood type be found?

26 Bodily fluids such as saliva, semen and vaginal secretions

27 What are the 4 different blood types?

28 A = I A I A or I A i B = I B I B or I B i AB = I A I B O = ii

29 The universal blood recipient

30 Type AB

31 These genetic disorders are most common among people of Eastern European origin – both parents must be carriers

32 Jewish genetic disorders such as: Tay-Sachs, Niemann-Pick, Canavan’s Disorder, Bloom’s Disease, Familial Dysautonomia and Fanconi Anemia

33 A diagram that shows the occurrence or appearance of a particular gene or organism from 1 generation to the next

34 Pedigree chart

35 Name common pedigree symbols


37 Interpret the following pedigree chart:

38 1 – autosomal dominant disease because the chart shows no carriers 2- in generation II, three out of the 5 siblings have the disease 3 – out of the generation II sibling that got married (2) who have the disease, they passed the disease to 50% of their offspring

39 Interpret this chart:

40 Sex linked trait (for color blindness) because most of the females are carriers and most of the males get the disorder

41 Cross an male with type AB blood with a female who is heterozygous type A

42 Female: I A i Male: I A I B Result: 2 type A offspring: I A I A, I a i 1 type AB: I A I B 1 type B: I B i

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