If Individual II-2 has two children with an unaffected partner,
what is the probability that they both will have the
condition?
Homework Answers
Answer:
II-2 (Aa) x (aa) unaffected parent ----Couple
| a | |
| A | Aa (affected)-1/2 |
| a | aa (unaffected)--1/2 |
The probability that they both will have the condition = 1/2 * 1/2 = 1/4
Add Answer to:
If Individual II-2 has two children with an unaffected partner,
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For each pedigree below determine the most likely mode of
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they have a dominant phenotype, but don’t know the genotype, then
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Part B Determining genotypes in pedigrees of X-linked
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The pedigree from Part A is shown below. Fill in the most likely
genotypes of the indicated individuals in the pedigree. Note that a
dominant allele followed by an underscore (_) indicates that either
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recessive) to each pink target. Drag one blue label (for condition
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a.) Before individual II-2 had an affected son, this family believed the condition followed a dominant...
a.) Before individual II-2 had an affected
son, this family believed the condition followed a dominant mode of
inheritance. Why does the phenotype of III-1 support a
recessive rather than a dominant mode of inheritance?
b.) Could the mode of inheritance actually be dominant? Explain
using appropriate genetic terms.
c.) In order to better understand the risk of passing this
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This action makes...
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inheritance and label each individual with a genotype. If you know
they have a dominant phenotype, but don’t know the genotype, then
label them with both possibilities. Please use the alleles A and a.
Modes of inheritance for these pedigrees are autosomal dominant or
autosomal recessive. For each pedigree determine if the alternative
mode (not the one you chose) is also possible.
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For each pedigree below determine the most likely mode of
inheritance and label each individual with a genotype. If you know
they have a dominant phenotype, but don’t know the genotype, then
label them with both possibilities. Please use the alleles A and a.
Modes of inheritance for these pedigrees are autosomal dominant or
autosomal recessive. For each pedigree determine if the alternative
mode (not the one you chose) is also possible.
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If individuals IV-3 and IV-6 were to have children:
(e) What is the probability that these children will express
this X-linked dominant trait? %
(f) If they only have sons, what is the probability that these
sons will express this X-linked dominant trait?
%
(g) If...
Part B Determining genotypes in pedigrees of X-linked
conditions
The pedigree from Part A is shown below. Fill in the most likely
genotypes of the indicated individuals in the pedigree. Note that a
dominant allele followed by an underscore (_) indicates that either
the dominant or the recessive allele may be present at the second
position. Drag one pink label (for condition A, autosomal
recessive) to each pink target. Drag one blue label (for condition
B, X-linked recessive) to each...
a.) Before individual II-2 had an affected
son, this family believed the condition followed a dominant mode of
inheritance. Why does the phenotype of III-1 support a
recessive rather than a dominant mode of inheritance?
b.) Could the mode of inheritance actually be dominant? Explain
using appropriate genetic terms.
c.) In order to better understand the risk of passing this
condition on to additional offspring, individual II-2 sought
genetic counseling which resulted in the drawing of this pedigree.
This action makes...
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