Question 1

If a person has a portion of number 5 chromosome missing,they may have

Accepted Answer

The condition where a person has a portion of number 5 chromosome missing is called cri du chat syndrome, also known as 5p- syndrome. It is characterized by a high-pitched cry, developmental delays, intellectual disabilities, and distinctive facial features. Down syndrome occurs when there is an extra copy of chromosome 21, Turner syndrome when there is a missing or incomplete X chromosome in females, Klinefelter syndrome when there is an extra X chromosome in males, and Jacobs syndrome when there is an extra Y chromosome in males. None of these conditions involve missing portions of chromosome 5.

Question 2

An XXX female would most likely result from nondisjunction in

Accepted Answer

Females have two X chromosomes, which are normally inherited from the mother (who has two X chromosomes) and the father (who has one X and one Y chromosome). If nondisjunction (failure of chromosomes to separate properly during cell division) occurs during the mother's egg formation, it can result in an egg with two X chromosomes, which when fertilized by a normal sperm with one X chromosome, would result in an XXX female.

Question 3

If a woman is a carrier for the color-blind recessive allele and her husband has normal vision,what are their chances that a son will be color-blind?

Accepted Answer

A son inherits his X chromosome from his mother and Y chromosome from his father. Since the mother is a carrier, there is a 50% chance she will pass the color-blind allele to her son, making him color-blind.

Question 4

Which refers to the movement of a piece of one chromosome to another nonhomologous chromosome?

Accepted Answer

Translocation refers to the movement of a piece of one chromosome to another nonhomologous chromosome. Inversion refers to a segment of a chromosome that is reversed end to end. Deletion refers to the loss of a chromosome segment. Duplication refers to the presence of an extra copy of a chromosome segment. Monosomy refers to the presence of only one copy of a particular chromosome instead of the usual two copies.

Question 5

Generally,it is not possible to determine whether nondisjunction failed to occur in oogenesis or spermatogenesis.However,it is possible to assert that _____ resulted in nondisjunction in ____.

Accepted Answer

XYY syndrome results from nondisjunction during spermatogenesis, leading to an extra Y chromosome in the sperm.

Question 6

If a chromosomal segment appears more than once in the same chromosome,it is termed a(n)

Accepted Answer

A chromosomal segment appearing more than once in the same chromosome is a duplication. Translocation refers to the exchange of segments between non-homologous chromosomes, deletion is the loss of a segment from a chromosome, inversion is the reversal of a segment within a chromosome, and polyploidy refers to having multiple sets of chromosomes.

Question 7

The cri du chat syndrome represents a chromosomal mutation type termed

Accepted Answer

Cri du chat syndrome is caused by a deletion on the short arm of chromosome 5.

Question 8

A person with an XO genotype is classified as having

Accepted Answer

A person with an XO genotype has only one X chromosome, which is characteristic of Turner syndrome.

Question 9

An individual who has an XXY combination of sex chromosomes is said to have _____ syndrome.

Accepted Answer

The XXY combination of sex chromosomes is a characteristic of Klinefelter syndrome. This occurs when a male has an extra X chromosome, resulting in developmental, behavioral, and physical differences.

Question 10

If an individual has a XYY genotype,they are classified as having

Accepted Answer

Individuals with a XYY genotype have Jacobs syndrome. This occurs when a male has an extra Y chromosome, resulting in a total of 47 chromosomes instead of the typical 46. Jacobs syndrome can lead to tall stature, learning difficulties, and behavioral problems. It is a rare genetic condition, affecting approximately 1 in 1,000 male births.

Question 11

Which of the following conditions is NOT due to a sex-linked gene?

Accepted Answer

Klinefelter syndrome is a chromosomal disorder caused by the presence of an extra X chromosome, rather than a specific sex-linked gene.

Question 12

If a person inherits two X chromosomes,this individual will be

Accepted Answer

Females inherit two X chromosomes, one from each parent. This makes them biologically female.

Question 13

Genes on the ___ chromosome determine if the sex of a child will be male or female.

Accepted Answer

The Y chromosome contains the SRY gene which determines male development, so the presence or absence of this chromosome in a child's DNA will determine their biological sex.

Question 14

A female that does not undergo puberty or menstruate or lacks breast development may have

Accepted Answer

Turner syndrome is a genetic condition in which a female is missing or has a partial X chromosome, leading to infertility, short stature, and underdeveloped sexual characteristics, including delayed or absent puberty, lack of menstruation, and incomplete breast development.

Question 15

Which refers to the addition of a repeat segment of a chromosome?

Accepted Answer

Duplication refers to the addition of a repeat segment of a chromosome.

Question 16

The trait diagrammed in Figure 24.1 is a(n)

Accepted Answer

The trait is a recessive X-linked trait because it typically appears more frequently in males, who have only one X chromosome, and can be passed from carrier mothers to their sons.

Question 17

Which refers to the loss of a portion of a chromosome?

Accepted Answer

Deletion refers to the loss of a portion of a chromosome.

Question 18

Considering that males can have Klinefelter (XXY)syndrome,XYY,and normal XY chromosomal combinations,and females can have Turner (XO)syndrome,poly-X (XXX,XXXX),and normal XX combinations,it is obvious that

Accepted Answer

Studies have shown that the minimal presence of one Y chromosome is necessary for the development of male reproductive organs and secondary sex characteristics. Thus, maleness results from the minimal presence of one Y chromosome. The presence or absence of X chromosomes can lead to different variations and disorders, but it is the Y chromosome that ultimately determines maleness.

Question 19

If a chromosomal segment is turned around 180$\degree$,the chromosomal mutation is termed a(n)

Accepted Answer

When a chromosomal segment is turned around 180 degrees, the resulting chromosomal mutation is referred to as an inversion. Inversions do not involve a gain or loss of genetic material, but rather a rearrangement of the existing genetic material. Translocations involve the exchange of genetic material between two different chromosomes, resulting in a transfer of genetic information. Duplications involve the presence of an extra copy of a portion of a chromosome, while deletions involve the loss of a portion of a chromosome. Monosomy refers to a condition in which an individual only has one copy of a particular chromosome, rather than the normal two copies.

Question 20

The reason that missing an X chromosome and having an extra X chromosome do NOT cause more harm than they do is best explained by the

Accepted Answer

Inactivation of any X beyond the first as a Barr body ensures that the genetic information from only one X chromosome is expressed in each cell, regardless of whether there is an extra X chromosome or a missing X chromosome. This mechanism helps to compensate for any genetic imbalance and prevent more harm from occurring.

Quiz 24: Chromosomal Inheritance and Genetic Disorders

If a person has a portion of number 5 chromosome missing,they may have

An XXX female would most likely result from nondisjunction in

If a woman is a carrier for the color-blind recessive allele and her husband has normal vision,what are their chances that a son will be color-blind?

Which refers to the movement of a piece of one chromosome to another nonhomologous chromosome?

Generally,it is not possible to determine whether nondisjunction failed to occur in oogenesis or spermatogenesis.However,it is possible to assert that _ resulted in nondisjunction in .

If a chromosomal segment appears more than once in the same chromosome,it is termed a(n)

The cri du chat syndrome represents a chromosomal mutation type termed

A person with an XO genotype is classified as having

An individual who has an XXY combination of sex chromosomes is said to have _____ syndrome.

If an individual has a XYY genotype,they are classified as having

Which of the following conditions is NOT due to a sex-linked gene?

If a person inherits two X chromosomes,this individual will be

Genes on the ___ chromosome determine if the sex of a child will be male or female.

A female that does not undergo puberty or menstruate or lacks breast development may have

Which refers to the addition of a repeat segment of a chromosome?

The trait diagrammed in Figure 24.1 is a(n)

Which refers to the loss of a portion of a chromosome?

Considering that males can have Klinefelter (XXY) syndrome,XYY,and normal XY chromosomal combinations,and females can have Turner (XO) syndrome,poly-X (XXX,XXXX) ,and normal XX combinations,it is obvious that

If a chromosomal segment is turned around 180 $\degree$ ,the chromosomal mutation is termed a(n)

The reason that missing an X chromosome and having an extra X chromosome do NOT cause more harm than they do is best explained by the

Quiz 24: Chromosomal Inheritance and Genetic Disorders

If a person has a portion of number 5 chromosome missing,they may have

An XXX female would most likely result from nondisjunction in

If a woman is a carrier for the color-blind recessive allele and her husband has normal vision,what are their chances that a son will be color-blind?

Which refers to the movement of a piece of one chromosome to another nonhomologous chromosome?

Generally,it is not possible to determine whether nondisjunction failed to occur in oogenesis or spermatogenesis.However,it is possible to assert that _____ resulted in nondisjunction in ____.

If a chromosomal segment appears more than once in the same chromosome,it is termed a(n)

The cri du chat syndrome represents a chromosomal mutation type termed

A person with an XO genotype is classified as having

An individual who has an XXY combination of sex chromosomes is said to have _____ syndrome.

If an individual has a XYY genotype,they are classified as having

Which of the following conditions is NOT due to a sex-linked gene?

If a person inherits two X chromosomes,this individual will be

Genes on the ___ chromosome determine if the sex of a child will be male or female.

A female that does not undergo puberty or menstruate or lacks breast development may have

Which refers to the addition of a repeat segment of a chromosome?

The trait diagrammed in Figure 24.1 is a(n)

Which refers to the loss of a portion of a chromosome?

Considering that males can have Klinefelter (XXY) syndrome,XYY,and normal XY chromosomal combinations,and females can have Turner (XO) syndrome,poly-X (XXX,XXXX) ,and normal XX combinations,it is obvious that

If a chromosomal segment is turned around 180 °\degree° ,the chromosomal mutation is termed a(n)

The reason that missing an X chromosome and having an extra X chromosome do NOT cause more harm than they do is best explained by the

Generally,it is not possible to determine whether nondisjunction failed to occur in oogenesis or spermatogenesis.However,it is possible to assert that _ resulted in nondisjunction in .

If a chromosomal segment is turned around 180 $\degree$ ,the chromosomal mutation is termed a(n)