Pedigree Genetics Problems: X-linked Recessive Class Date scenario, label each individual in each family with their genotype, and answer the questions. If you are nor er an individual, write the allele you do know and a blank "_" next to the allele you know. if you are not sure if an individual is XA Xa or Aa, you would write X^- Allele Notation Key: nal blood clotting Xh = hemophilia Allele Notation Key: XB = normal male hair Xb = male pattern baldness nd woman with normal blood clotting ren and they discover that their on has hemophilia, a serious blood prder. A gene on the X chromosome affects how men lose their hair as they age. Male pattern baldness is caused by a recessive allele in that gene. Male pattern baldness does not afFfect women. normal male hair emophilia normal blood clotting male pattern baldness I 2 II 3 나 2 3 4 TTT

Biology Today and Tomorrow without Physiology (MindTap Course List)
5th Edition
ISBN:9781305117396
Author:Cecie Starr, Christine Evers, Lisa Starr
Publisher:Cecie Starr, Christine Evers, Lisa Starr
Chapter9: Patterns Of Inheritance
Section: Chapter Questions
Problem 6SQ
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Pedigree
Genetics Problems: X-linked Recessive
Class:
Date:
Read each scenario, label each individual in each family with their genotype, and answer the questions. If you are hoi
sure whether an individual, write the allele you do know and a blank "_" next to the allele you know.
For example, If you are not sure if an individual is XA Xa or Aa, you would write X^_ .
Allele Notation Key:
XH = normal blood clotting Xh = hemophilia
%3D
Allele Notation Key:
%3D
XB = normal male hair
One man and woman with normal blood clotting
have 4 children and they discover that their
youngest son has hemophilia, a serious blood
clotting disorder.
Xb = male pattern baldness
A gene on the X chromosome affects how men lose their hair
as they age. Male pattern baldness is caused by a recessive
allele in that gene. Male pattern baldness does not affect
%3D
women.
hemophilia
normal blood
clotting
male pattern
baldness
O normal male hair
2
II
II
3
나
3
나
III
I. Write each individual's genotype in the blank
next to each one.
4. Write each individual's genotype in the blank next to each one.
5. Remembering that females are never affected by male
pattern baldness, how do you know that individual I-2 has one
at least one XB allele?
2. If individuals I-l and I-2 have another
daughter,
what is the probability
that she will have hemophilia?
3. If individuals I-l and I-2 have another son,
what is the probability
that he will have hemophilia?
6. Remembering that females are never affected by male
pattern baldness, how do you know that individual II-2 has one
at least one Xb allele?
You are a genetic counselor and you meet with a
couple who are planning to have a baby. Fill in
the pedigree on the right with their family
history details. They are concerned that several
members of their family have hemophilia and
they want to you to tell them the probability
that their future child will have hemophilia, a
disorder caused by a x-linked recessive allele.
Both the woman and the man are healthy but
each of them has a brother who died of
hemophilia at a young age. Both parents have
healthy parents.
7. In the space provided on the right, draw a
pedigree for this family. Make sure you include
generation numbers, individual numbers, and a
key to describe your shading choices. Write
each genotype next to each individual. Decide
what the probability is that they will have a child
afflicted by hemophilia. Explain your answer
below the pedigree.
Transcribed Image Text:Pedigree Genetics Problems: X-linked Recessive Class: Date: Read each scenario, label each individual in each family with their genotype, and answer the questions. If you are hoi sure whether an individual, write the allele you do know and a blank "_" next to the allele you know. For example, If you are not sure if an individual is XA Xa or Aa, you would write X^_ . Allele Notation Key: XH = normal blood clotting Xh = hemophilia %3D Allele Notation Key: %3D XB = normal male hair One man and woman with normal blood clotting have 4 children and they discover that their youngest son has hemophilia, a serious blood clotting disorder. Xb = male pattern baldness A gene on the X chromosome affects how men lose their hair as they age. Male pattern baldness is caused by a recessive allele in that gene. Male pattern baldness does not affect %3D women. hemophilia normal blood clotting male pattern baldness O normal male hair 2 II II 3 나 3 나 III I. Write each individual's genotype in the blank next to each one. 4. Write each individual's genotype in the blank next to each one. 5. Remembering that females are never affected by male pattern baldness, how do you know that individual I-2 has one at least one XB allele? 2. If individuals I-l and I-2 have another daughter, what is the probability that she will have hemophilia? 3. If individuals I-l and I-2 have another son, what is the probability that he will have hemophilia? 6. Remembering that females are never affected by male pattern baldness, how do you know that individual II-2 has one at least one Xb allele? You are a genetic counselor and you meet with a couple who are planning to have a baby. Fill in the pedigree on the right with their family history details. They are concerned that several members of their family have hemophilia and they want to you to tell them the probability that their future child will have hemophilia, a disorder caused by a x-linked recessive allele. Both the woman and the man are healthy but each of them has a brother who died of hemophilia at a young age. Both parents have healthy parents. 7. In the space provided on the right, draw a pedigree for this family. Make sure you include generation numbers, individual numbers, and a key to describe your shading choices. Write each genotype next to each individual. Decide what the probability is that they will have a child afflicted by hemophilia. Explain your answer below the pedigree.
Pedigree Genetics ProblemS: Autosomal Recessive
Read each scenario, label each individual in each family with their genotype, and answer the questions. If you are not
sure whether an individual, write the allele you do know and a blank "_" next to the allele you know.
For example, if you are not sure if an individual is AA or Aa, you would write A .
Allele Notation Key:
Allele Notation Key:
A = normal pigments
E = wet earwax
e = dry earwax
%3D
a = albino
%3D
%3|
Two people with wet earwax get married and have 4
children. When the fourth child is born, they notice that
this child has dry earwax! Dry earwax is a recessive
allele and more rare in European populations.
There is a recessive allele that causes albinism in
humans. People with albinism lack melanin pigment in
their skin. The following family has many members who
are albinos.
Dry Earwax
Wet Earwax
albino
O normal pigments
ob w
I.
2
II
II
3
4
2
4
III
L Write each individual's genotype in the blank next to
each one.
3. Write each individual's genotype in the blank next to
each one.
2 If individuals I-l and I-2 have a 5th child, what is the
probability that he or she will have dry earwax?
You are a genetic counselor and you meet with a
couple who are planning to have a baby. Fill in
the pedigree on the right with their family
history details. They are concerned that several
members of their family have cystic fibrosis
and they want to you to tell them the
probability that their future child will have
cystic fibrosis, a disorder caused by a recessive
allele. Both the woman and the man have
healthy lungs, but each of them has a sibling
who died from cystic fibrosis at and early age.
The woman has a younger brother who died
from cystic fibrosis and the man has an older
brother who died from cystic fibrosis. The
father's parents were also healthy and the
mother's parents were also healthy.
woH a
Sworel uoy cb w
4. In the space provided on the right, draw a
pedigree for this family. Make sure you include
generation numbers, individual numbers, and a
key to describe your shading choices. Decide
what the probability is that they will have a child
afflicted by cystic fibrosis. Explain your answer
below the pedigree.
(C) Bethany Lau 2016
2.
3.
Transcribed Image Text:Pedigree Genetics ProblemS: Autosomal Recessive Read each scenario, label each individual in each family with their genotype, and answer the questions. If you are not sure whether an individual, write the allele you do know and a blank "_" next to the allele you know. For example, if you are not sure if an individual is AA or Aa, you would write A . Allele Notation Key: Allele Notation Key: A = normal pigments E = wet earwax e = dry earwax %3D a = albino %3D %3| Two people with wet earwax get married and have 4 children. When the fourth child is born, they notice that this child has dry earwax! Dry earwax is a recessive allele and more rare in European populations. There is a recessive allele that causes albinism in humans. People with albinism lack melanin pigment in their skin. The following family has many members who are albinos. Dry Earwax Wet Earwax albino O normal pigments ob w I. 2 II II 3 4 2 4 III L Write each individual's genotype in the blank next to each one. 3. Write each individual's genotype in the blank next to each one. 2 If individuals I-l and I-2 have a 5th child, what is the probability that he or she will have dry earwax? You are a genetic counselor and you meet with a couple who are planning to have a baby. Fill in the pedigree on the right with their family history details. They are concerned that several members of their family have cystic fibrosis and they want to you to tell them the probability that their future child will have cystic fibrosis, a disorder caused by a recessive allele. Both the woman and the man have healthy lungs, but each of them has a sibling who died from cystic fibrosis at and early age. The woman has a younger brother who died from cystic fibrosis and the man has an older brother who died from cystic fibrosis. The father's parents were also healthy and the mother's parents were also healthy. woH a Sworel uoy cb w 4. In the space provided on the right, draw a pedigree for this family. Make sure you include generation numbers, individual numbers, and a key to describe your shading choices. Decide what the probability is that they will have a child afflicted by cystic fibrosis. Explain your answer below the pedigree. (C) Bethany Lau 2016 2. 3.
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