3. In humans, the ABO blood types are genetically determined by three alleles th
ID: 255216 • Letter: 3
Question
3. In humans, the ABO blood types are genetically determined by three alleles that occur at the same locus. Since each individual is diploid and carries two alleles for blood type, there are six possible genotypes in our population. List the six genotypes below and assign a phenotype to each genotype based upon the following information. Allele A is dominant over O. Allele B is dominant over O. Alleles A &B; are codominant. Genotype Phenotype (Blood type) 2. 3. 4. 5. 6 2. 3. 4. 5. 6 If a man heterozygous for type A blood marries a woman heterozygous for type B blood, what are the possible genotypes and phenotypes of their offspring? Genotype of man: Genotype of woman: Genotypes and Phenotypes of offspring: 4. In humans, susceptibility to migraine headaches is appare determined by a dominant gene (M) while resistance to migraines recessive (m). Cystic fibrosis is caused by a recessive gene (c) in hum while one copy of the dominant gene (C) confers a normal phenotype man and a woman who do not have the cystic fibrosis phenotype but both susceptible to migraine headaches marry and have 16 children( to imagine!). Nine of the children do not have the cystic fibrosis pheno but are susceptible to migraine headache; three have cystic fibrosis are migraine susceptible; three do not have cystic fibrosis and do no migraines; and one has cystic fibrosis and does not get migraines.Explanation / Answer
Answer:
3).
S. No
Genotype
Phenotype (Blood type)
1
IAIA
A
2
IAi
A
3
IBIB
B
4
IBi
B
5
IAIB
AB
6
ii
O
Genotype of man = IAi
Genotype of woman = IBi
IB
i
IA
IAIB(AB-25%)
IAi (A-25%)
i
IBi(B-25%)
ii (O-25%)
4).
CcMm x CcMm
CM
Cm
cM
cm
CM
CCMM (migrane)
CCMm (migrane)
CcMM (migrane)
CcMm (migrane)
Cm
CCMm (migrane)
CCmm(neither cysic fibrosis, nor migrane)
CcMm (migrane)
Ccmm(neither cysic fibrosis, nor migrane)
cM
CcMM (migrane)
CcMm (migrane)
ccMM (cystic fibrosis, migrane)
ccMm (cystic fibrosis, migrane)
cm
CcMm (migrane)
Ccmm(neither cysic fibrosis, nor migrane)
ccMm (cystic fibrosis, migrane)
ccmm (cystic fibrosis, no migrane)
S. No
Genotype
Phenotype (Blood type)
1
IAIA
A
2
IAi
A
3
IBIB
B
4
IBi
B
5
IAIB
AB
6
ii
O
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