I got these answers wrong on my test and was wondering why ? Here are the questi
ID: 10422 • Letter: I
Question
I got these answers wrong on my test and was wondering why ? Here are the questions:1. A baby girl, karyotypically a normal male (46, XY) is born to a man and a woman. Later, this infant is diagnosed with sex reversal and Turner's syndrome. Answer the following?
How did this individual become phenotypically (XO)?
2. A species has 4n=24. How many chromosomes will be found in all somatic cells produced in each of the following species variants?
a. monosomic
b. trisomic
c. hexosomic
d. nullosomic
3. Hemophilia A is due to the sex-linked recessive gene,h/ A man with Hemopjilia and a woman, with blood that clots normally, have an XXY son who has Hemophilia.
This son must have resulted from non-disjunction in the ( tell which parent)in meiosis (I or II or either) to produce (sperm or egg) with the genotype that fused with a (sperm or egg) with the genotype .
4. A three year old child exhibited some early indications of Turner’s syndrome, which results from a 45, X chromosome composition (Karyotype). Karyotypic analysis shows two cell types 46,XX (normal) and 45,X.
a. In what cell division process did this karyotypic mosaicism likely occur?
b. How did this mosaicism arise, i.e., what mechanism lead to this mosaic karyotype?
5. A chromosome has the segments labeled below
A B centromere C D E F G
What type of chromosome abnormalities are required to alter this chromosome to each of the following chromosomes?
a. A B B centromere E D C F G
b. A B centromere V W X Y Z
c. A B centromere C D G
d. C centromere B A D E F G
6. Consider a hypothetical allotetraploid plant that is heterozygous for one gene pair (AABb)
a. With respect to the genes described , what would be the genotype of the gametes produced from this plant?
b. What would be the ploidy number of the offspring produced from a mating between the above allotetraploid plant and an allohexaploid plant?
Explanation / Answer
1. A baby girl, karyotypically a normal male (46, XY) is born to a man and a woman. Later, this infant is diagnosed with sex reversal and Turner's syndrome. Answer the following?
How did this individual become phenotypically (XO)?
Duplications of Xp, leades to loss of Y-chromosom e...formation of Turner's syndrome
2. A species has 4n=24. How many chromosomes will be found in all somatic cells produced in each of the following species variants?
n= 6
a. monosomic---- (2n+1)=11
b. trisomic------(2n+1)= 13
c. hexosomic-6n= 36
d. nullosomic (2n-2)=10
3. Hemophilia A is due to the sex-linked recessive gene,h/ A man with Hemopjilia and a woman, with blood that clots normally, have an XXY son who has Hemophilia.
FATHER ------AFFECTED FOR sex-linked recessive gene,h
MOTHER IS CARRIER FOR sex-linked recessive gene,h
as the son receives TWO X CHROMOSMES FROM THE MOTHER
Y CHROMOSMES FROM THE FATHER
ONE sex-linked recessive gene,h IS ENOUGH FOR EXPRESSIOON OF TRAIT IN MALE
This son must have resulted from non-disjunction in the ( tell which parent)in meiosis (I or II or either) to produce (sperm or egg) with the genotype that fused with a (sperm or egg) with the genotype .
4. A three year old child exhibited some early indications of Turner’s syndrome, which results from a 45, X chromosome composition (Karyotype). Karyotypic analysis shows two cell types 46,XX (normal) and 45,X.
THE BABY IS HAVING MOSIAC CONSITITUTION
LIKE 46,XX /45,X.
a. In what cell division process did this karyotypic mosaicism likely occur?
46,XX /45,X.
DUE TO NON DISJUNCTION AT POST ZYGOTIC DIVISIONS
b. How did this mosaicism arise, i.e., what mechanism lead to this mosaic karyotype?
NON DISJUNCTION AT m1 and m2 satge of during gametogenesis or ovogenesis
5. A chromosome has the segments labeled below
A B centromere C D E F G
What type of chromosome abnormalities are required to alter this chromosome to each of the following chromosomes?
a. A B B centromere E D C F G
translocation
b. A B centromere V W X Y Z
translocation
c. A B centromere C D G
deletion
d. C centromere B A D E F G
translocation
6. Consider a hypothetical allotetraploid plant that is heterozygous for one gene pair (AABb)
a. With respect to the genes described , what would be the genotype of the gametes produced from this plant?
AB
Ab
b. What would be the ploidy number of the offspring produced from a mating between the above allotetraploid plant and an allohexaploid plant?
allotetraploid plant (4n) x allohexaploid plant(6n)
gametets-2n-------------------3n
offspring----------5n
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