BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
10th Edition
ISBN: 9781305967359
Author: STARR
Publisher: CENGAGE L
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Chapter 14, Problem 4SA
Summary Introduction
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Mendelian Genetics and Non-Mendelian Genetics: Huntington’s disease, a neurodegenerative genetic disorder that typically becomes noticeable in middle age, is due to an autosomal dominant allele. Sickle cell anemia, on the other hand, is a genetic blood disorder due to a recessive allele. Jillian is a carrier of the allele for sickle cell anemia but has no sign of any neurodegenerative disorder in her family. She married Jacobwhose father died of Huntington’s disease. His mother, however, is not inflicted with that condition. Neither of his parents exhibit sickle cell anemia.
1. Give the genotypes of Jillian and Jacob.
Assuming that they will have 4 children, what is the probability that:
2. all their children will be normal?
3. they will have a son with Huntington’s disease?
4. they will have a daughter inflicted with both conditions
Classical Mendelian Genetics, Incomplete Dominance, Codominance, and Multiple Alleles
1. Complete the table given below regarding the phenotype and genotype ratios in completely
dominant traits. R and r represent the dominant and recessive allele, respectively.
Type of Cross
rrx rr
RR x rr
Rrx rr
Rrx Rr
Genotype Ratio
Phenotype Ratio
RR x Rr
RR X RR
*How would the genotype ratios be affected if the mode o inheritance in incomplete dominance?
Codominance?
2. In dogs, barer trait is controlled by a dominant gene D and the silent trait by the recessive gene d.
Normal tail is dependent on a dominant gene M and the screw m. Give the probable genotypes of
the parents in the following crosses:
Phenotype of parents
Phenotypes of progeny
Genotypes of parents
Barker
Barker Silent
Silent
normal
screw
normal
normal
a. silent normal x silent normal
b. barker normal x silent normal
0
0
6
2
7
2
8
3
c. barker normal x silent screw
4
5
5
3
d. barker screw x silent normal
6
0
0
0
e. barker screw x…
Neo-Mendelian Genetics: Complete dominance and overdominance
Huntington’s disease, a neurodegenerative genetic disorder that typically becomes noticeable in middle age, is due to an autosomal dominant allele. Sickle cell anemia, on the other hand, is a genetic blood disorder due to a recessive allele. Mary is a carrier of the allele for sickle cell anemia but has no sign of any neurodegenerative disorder in her family. She married Paul whose father died of Huntington’s disease. His mother, however, is not inflicted with that condition. Neither of his parents exhibits sickle cell anemia.
What are the genotypes of Mary and Paul?
If they plan to have four children, what is the probability that:
all their children will be normal? ____________
they will have a son with Huntington’s disease? ___________
they will have a daughter inflicted with both conditions?____________
Chapter 14 Solutions
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
Ch. 14 - Constructing a family pedigree is particularly...Ch. 14 - Prob. 2SACh. 14 - Prob. 3SACh. 14 - Prob. 4SACh. 14 - Prob. 5SACh. 14 - A trait that is present in a male child but not in...Ch. 14 - Color blindness is a case of ________ inheritance....Ch. 14 - Prob. 8SACh. 14 - Alleles for Tay-Sachs disease are inherited in an...Ch. 14 - Prob. 10SA
Ch. 14 - Prob. 11SACh. 14 - Prob. 12SACh. 14 - Prob. 13SACh. 14 - Klinefelter syndrome XXY can be easily diagnosed...Ch. 14 - Match the chromosome terms appropriately. ___...Ch. 14 - Does the phenotype indicated by the red circles...Ch. 14 - Human females have two X chromosomes XX; males...Ch. 14 - Somatic cells of individuals with Down syndrome...Ch. 14 - An allele responsible for Marfan syndrome Section...Ch. 14 - Both Duchenne muscular dystrophy and color...
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