questions: is the disorder recessive or dominant? are the parents homozygous or heterozygous? infer...

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ANALYZE THE PEDIGREE: TWO PARENTS DO NOT HAVE A GENETIC DISORDER BUT THEIR CHILD HAS THE DISORDER. QUESTIONS: Is the disorder recessive or dominant? Are the parents homozygous or heterozygous? Infer what the parents

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Page 1: QUESTIONS: Is the disorder recessive or dominant? Are the parents homozygous or heterozygous? Infer what the parents genotypes are?

ANALYZE THE PEDIGREE:

TWO PARENTS DO NOT HAVE A GENETIC DISORDER BUT THEIR CHILD HAS THE DISORDER.QUESTIONS:Is the disorder recessive or dominant? Are the parents homozygous or heterozygous?Infer what the parents genotypes are?

Page 2: QUESTIONS: Is the disorder recessive or dominant? Are the parents homozygous or heterozygous? Infer what the parents genotypes are?

Analyze the cross, is this scenario possible?

Page 3: QUESTIONS: Is the disorder recessive or dominant? Are the parents homozygous or heterozygous? Infer what the parents genotypes are?

Incomplete Dominance

The heterozygous phenotype is an intermediate between the two homozygous phenotypes.

RR rr

Rr

Page 4: QUESTIONS: Is the disorder recessive or dominant? Are the parents homozygous or heterozygous? Infer what the parents genotypes are?

Codominance

Both alleles are expressed in the heterozygote.

CheckeredChickens

Page 5: QUESTIONS: Is the disorder recessive or dominant? Are the parents homozygous or heterozygous? Infer what the parents genotypes are?

Multiple Alleles

Some traits are determined by multiple alleles.

Human Blood Types

Page 6: QUESTIONS: Is the disorder recessive or dominant? Are the parents homozygous or heterozygous? Infer what the parents genotypes are?

Epistasis

One gene hides the effect of other genes.

E_ B_ E_ bb ee bb eeB_

Page 7: QUESTIONS: Is the disorder recessive or dominant? Are the parents homozygous or heterozygous? Infer what the parents genotypes are?

Polygenic Traits

Determined by multiple pairs of genes. Skin color Height Eye color

AaBbCcDd AABBCCDD aabbccdd

Page 8: QUESTIONS: Is the disorder recessive or dominant? Are the parents homozygous or heterozygous? Infer what the parents genotypes are?

Human Blood Types

Alleles

IA Dominant

IB Dominant

i Recessive

Page 9: QUESTIONS: Is the disorder recessive or dominant? Are the parents homozygous or heterozygous? Infer what the parents genotypes are?

Human Blood Types

Blood Type

Genotype

Antigen Antibodies

A IA IA

IA iA B

B IBIB

IBiB A

AB IA IB A and B

None

O ii None A and B

Page 10: QUESTIONS: Is the disorder recessive or dominant? Are the parents homozygous or heterozygous? Infer what the parents genotypes are?

Rh Factor

Blood Protein Rh+ Dominant Rh - Recessive

Page 11: QUESTIONS: Is the disorder recessive or dominant? Are the parents homozygous or heterozygous? Infer what the parents genotypes are?

Determine the genotypes of the parents if the father is blood type A, the mother is blood type B, the three offspring's blood types are O, AB and B.

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