last one please help me on question 7 ? ClassesGradesBp Schedule0A Biology 2020-. Jocelyn Velazquez - Kami Export - Sex Linked Traits.pdf91%7. In humans, Pseudohypertrophic Muscular Dystrophy is a condition in which the nerves waste away duringearly life, resulting in death by the early teens. This lethal disease is due to a recessive sex-linked gene. Acouple has five children - three boys, and two girls. The oldest boy has the disease. You are their familygeneticist and they come to you for advice. What could you tell them about the chances of their other twoboys and their two girls also having this disease? (HINT: You must detemine the parent genotypes and thenshow a Punnett square. Use that as your source for advice giving.)parents =10 year old boy =female childrenmale childrenH 8. Two hornless sheep are mathomless. Determine what is dominant and what is recessive, and determine the genotypes of the parentAbout ½ of the male offspring have horns while the female offspring are allsheep. Show the Punnett square for the two hornless sheep.XHXhparents =_XYXXdominant trait HormlessXHХН, ХНXH,Xhrecessive trait HornsYXH, YXh,YDELL24&4%#3

Answered: In humans, Pseudohypertrophic Muscular…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

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Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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last one please help me on question 7 ?

Classes
Grades
Bp Schedule
0A Biology 2020-. Jocelyn Velazquez - Kami Export - Sex Linked Traits.pdf
91%
7. In humans, Pseudohypertrophic Muscular Dystrophy is a condition in which the nerves waste away during
early life, resulting in death by the early teens. This lethal disease is due to a recessive sex-linked gene. A
couple has five children - three boys, and two girls. The oldest boy has the disease. You are their family
geneticist and they come to you for advice. What could you tell them about the chances of their other two
boys and their two girls also having this disease? (HINT: You must detemine the parent genotypes and then
show a Punnett square. Use that as your source for advice giving.)
parents =
10 year old boy =
female children
male children
H 8. Two hornless sheep are mat
homless. Determine what is dominant and what is recessive, and determine the genotypes of the parent
About ½ of the male offspring have horns while the female offspring are all
sheep. Show the Punnett square for the two hornless sheep.
XH
Xh
parents =_XY
XX
dominant trait Hormless
XH
ХН, ХН
XH,Xh
recessive trait Horns
Y
XH, Y
Xh,Y
DELL
24
&
4
%#3

Expert Solution

Step 1

In humans females possess two X chromosomes and males possess one X chromosome and one Y chromosome.

Given it is a sex linked recessive disorder.It should be X-linked disorder. It is not Y-linked .If it is Y-linked,then male parent might be affected and won't exist at all ,since this is a lethal disorder. Also, X chromosome of the male parent is not affected,it is a normal one.

Therefore genotype of male parent is XY.

It's affect is seen only in the absence of dominant allele. One affected X chromosome is enough to have it's effect in males because males have only one copy of X chromosomes. Two X chromosomes need to be affected to see it's effect in female individuals.

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