b23 ppt patterns of heredity and human genetics
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Week 23Week 23
Patterns of Heredity and Human Patterns of Heredity and Human GeneticsGenetics
Ch. 12 pg 308 From mother
From father
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pedigreepedigree
A graphic representation of genetic A graphic representation of genetic inheritance, a diagram made up of inheritance, a diagram made up of symbolssymbols
traittrait
Any characteristic that is inheritedAny characteristic that is inherited
heterozygoheterozygousus
When an individual When an individual
• has two different alleles for a trait, ex. Bb, Rrhas two different alleles for a trait, ex. Bb, Rr
carrier carrier
Heterozygous Heterozygous individual,individual,Carries recessive alleleCarries recessive allele
cystic fibrosiscystic fibrosis
Results in the formation and accumulation of Results in the formation and accumulation of thick mucus in the lungs and digestive tractthick mucus in the lungs and digestive tract
Tay-Sachs DiseaseTay-Sachs DiseaseLacking enzyme that breaks down lipid in central Lacking enzyme that breaks down lipid in central
nervous system = accumulation of lipidnervous system = accumulation of lipid
PhenylketonuriaPhenylketonuria
Lacking enzyme that which converts Lacking enzyme that which converts aa phenylalanine to aa tyrosine = aa phenylalanine to aa tyrosine = accumulation of PHEaccumulation of PHE
Dominant Dominant trait trait
Results from one Results from one dominant dominant allele from allele from EITHER parent EITHER parent
Example: BExample: B
Results from one Results from one allele from allele from BOTH parentsBOTH parents
Example: bExample: b
Recessive Recessive trait trait
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fetusfetus
A developing A developing babybaby
cleft chin traitcleft chin trait
Simple dominant trait, indentation of Simple dominant trait, indentation of chinchin
widow’s peak hairline widow’s peak hairline traittrait
Simple dominant trait, hairline comes Simple dominant trait, hairline comes to a pointto a point
attached earlobes traitattached earlobes trait
Simple recessive trait, earlobes do not Simple recessive trait, earlobes do not hang freelyhang freely
hitchhiker’s thumb traithitchhiker’s thumb trait
Simple dominant trait, bend thumb Simple dominant trait, bend thumb backwards 30backwards 30oo
almond shaped eyes traitalmond shaped eyes trait
Dominant trait, eyesDominant trait, eyes
thick lips traitthick lips trait
Dominant trait, lipsDominant trait, lips
Huntington’s DiseaseHuntington’s Disease
Lethal genetic disorder Lethal genetic disorder caused by a rare dominant caused by a rare dominant allele, allele,
causes breakdown in certain causes breakdown in certain areas of the brainareas of the brain
And now for the quizAnd now for the quiz
1 Simple dominant trait, bend thumb 1 Simple dominant trait, bend thumb backwards 30backwards 30oo
2 Dominant trait, lips2 Dominant trait, lips
3 Lethal genetic disorder 3 Lethal genetic disorder caused by a rare caused by a rare dominant allele, dominant allele,
causes breakdown in causes breakdown in certain areas of the braincertain areas of the brain
4 A developing 4 A developing babybaby
5 Results in the formation and accumulation of 5 Results in the formation and accumulation of thick mucus in the lungs and digestive tractthick mucus in the lungs and digestive tract
6 Simple dominant trait, indentation of 6 Simple dominant trait, indentation of chinchin
7 Lacking enzyme that which converts 7 Lacking enzyme that which converts aa phenylalanine to aa tyrosine = aa phenylalanine to aa tyrosine = accumulation of PHEaccumulation of PHE
8 Results from 8 Results from one dominant one dominant allele from allele from EITHER parent EITHER parent
Example: BExample: B
9 Results from 9 Results from one allele from one allele from BOTH parentsBOTH parents
Example: bExample: b
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10 Any characteristic that is inherited10 Any characteristic that is inherited
11 Simple dominant trait, hairline 11 Simple dominant trait, hairline comes to a pointcomes to a point
12 A graphic representation of genetic 12 A graphic representation of genetic inheritance, a diagram made up of inheritance, a diagram made up of symbolssymbols
13 Simple recessive trait, earlobes do 13 Simple recessive trait, earlobes do not hang freelynot hang freely
14 When an individual 14 When an individual
• has two different alleles for a trait, ex. Bb, Rrhas two different alleles for a trait, ex. Bb, Rr
15 Heterozygous 15 Heterozygous individual, carries individual, carries recessive allelerecessive allele
16 Lacking enzyme that breaks down lipid in 16 Lacking enzyme that breaks down lipid in central nervous system = accumulation of lipidcentral nervous system = accumulation of lipid
And now for the answersAnd now for the answers
hitchhiker’s thumb traithitchhiker’s thumb trait
1 Simple dominant trait, bend thumb 1 Simple dominant trait, bend thumb backwards 30backwards 30oo
thick lips traitthick lips trait
2 Dominant trait, lips2 Dominant trait, lips
Huntington’s DiseaseHuntington’s Disease
3 Lethal genetic disorder 3 Lethal genetic disorder caused by a rare caused by a rare dominant allele, dominant allele,
causes breakdown in causes breakdown in certain areas of the braincertain areas of the brain
fetusfetus
4 A developing 4 A developing babybaby
cystic fibrosiscystic fibrosis
5 Results in the formation and accumulation of 5 Results in the formation and accumulation of thick mucus in the lungs and digestive tractthick mucus in the lungs and digestive tract
cleft chin traitcleft chin trait
6 Simple dominant trait, indentation of 6 Simple dominant trait, indentation of chinchin
PhenylketonuriaPhenylketonuria
7 Lacking enzyme that which converts 7 Lacking enzyme that which converts aa phenylalanine to aa tyrosine = aa phenylalanine to aa tyrosine = accumulation of PHEaccumulation of PHE
Dominant Dominant trait trait
8 Results from 8 Results from one dominant one dominant allele from allele from EITHER parent EITHER parent
Example: BExample: B
9 Results from 9 Results from one allele from one allele from BOTH parentsBOTH parents
Example: bExample: b
recessive recessive trait trait
Click for list
traittrait
10 Any characteristic that is inherited10 Any characteristic that is inherited
widow’s peak hairline widow’s peak hairline traittrait
11 Simple dominant trait, hairline 11 Simple dominant trait, hairline comes to a pointcomes to a point
pedigreepedigree
12 A graphic representation of genetic 12 A graphic representation of genetic inheritance, a diagram made up of inheritance, a diagram made up of symbolssymbols
attached earlobes traitattached earlobes trait
13 Simple recessive trait, earlobes do 13 Simple recessive trait, earlobes do not hang freelynot hang freely
heterozygoheterozygousus
14 When an individual 14 When an individual
• has two different alleles for a trait, ex. Bb, Rrhas two different alleles for a trait, ex. Bb, Rr
carrier carrier
15 Heterozygous 15 Heterozygous individualindividual
Tay-Sachs DiseaseTay-Sachs Disease16 Lacking enzyme that breaks down lipid in 16 Lacking enzyme that breaks down lipid in
central nervous system = accumulation of lipidcentral nervous system = accumulation of lipid
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