Question 1

Six fingers on onhanwoulbclassifieas

Accepted Answer

Six fingers is a genetic abnormality, which means it is a variation in the genetic material that is not considered to be a disease or illness.

Question 2

If a study of several pedigrees demonstratethat two parents arnormal but their children express a trait, then thtrait is controlleby

Accepted Answer

If two parents are normal (do not express the trait) but their children express the trait, it suggests that the trait is controlled by a recessive gene. This means both parents are carriers of the recessive allele, and the trait is expressed in the children when they inherit two copies of the recessive allele.

Question 3

A human X-linkegenis

Accepted Answer

A human X-linked gene is located on the X chromosome.

Question 4

Males tento baffectein greater numbers by X-linkerecessivgenetic disorders than arfemales because

Accepted Answer

Males are more affected by X-linked recessive disorders because they have only one X chromosome. If that X chromosome carries the recessive gene for a disorder, they will express the disorder since they lack a second X chromosome that could potentially carry a normal dominant allele.

Question 5

Hemophilia

Accepted Answer

Hemophilia is a rare genetic disorder that affects the blood's ability to clot. It is more common among men than women because it is an X-linked recessive trait. This means that the gene for hemophilia is located on the X chromosome, and males only have one X chromosome. Females have two X chromosomes, so they are less likely to be affected by hemophilia. Hemophilia was common in English royalty because Queen Victoria was a carrier of the gene.

Question 6

Likmany genetic disorders, galactosemia is a disruption of a metabolic pathway duto a malfunctioning

Accepted Answer

Galactosemia is caused by a deficiency in the enzyme responsible for metabolizing galactose, leading to its accumulation in the body.

Question 7

Achondroplasia is an autosomal dominant disorder.If a newly weddecouplfinds after genetic screening that they arboth heterozygous for alleles responsiblfor that genetic disorder, what is their chancto hava chilwith achondroplasia?

Accepted Answer

When both parents are heterozygous for an autosomal dominant disorder, there is a 75% chance that their child will inherit at least one dominant allele and thus have the disorder. The possible genotypes for the child are: 25% homozygous dominant (affected), 50% heterozygous (affected), and 25% homozygous recessive (unaffected).

Question 8

Syndrommeans

Accepted Answer

A syndrome is a set of symptoms that occur together and characterize a particular condition or disease.

Question 9

Thprobability of producing a normal chilby two parents who arcarriers for an autosomal recessivdisorder is

Accepted Answer

The answer of Thprobability of producing a normal chilby two...

Question 10

Galactosemia

Accepted Answer

Galactosemia is inherited in an autosomal recessive pattern, which means that an individual must inherit two copies of the mutated gene (one from each parent) in order for the condition to be expressed. Therefore, it must be homozygous to be expressed.

Question 11

An autosomal recessivdisorder

Accepted Answer

An autosomal recessive disorder requires that both parents carry at least one copy of the recessive gene for the disorder to appear in their children.

Question 12

A woman is diagnoseto havthgenetic diseasknown as Huntington's disorder.It is a rardefect causeby an autosomal dominant allele.Thchancfor any onof her children to inherit thdiseasis

Accepted Answer

Huntington's disorder is caused by an autosomal dominant allele, meaning each child has a 50% (1/2) chance of inheriting the allele from an affected parent.

Question 13

If a study of several pedigrees demonstratethat two parents express a characteristic annonof their children express it, then thtrait is controlleby

Accepted Answer

The answer of If a study of several pedigrees demonstratethat...

Question 14

Achondroplasia is an autosomal dominant disorder.If a newly weddecouplfinds after genetic screening that they arboth heterozygous for alleles responsiblfor that genetic disorder, what is their chancto hava normal child?

Accepted Answer

When both parents are heterozygous for an autosomal dominant disorder, there is a 25% chance that their child will inherit two normal alleles, resulting in a normal phenotype.

Question 15

An X-linkecarrier is a

Accepted Answer

A female who is heterozygous for an X-linked gene is called a carrier.

Question 16

Achondroplasia is an autosomal dominant disorder.If a newly weddecouplfinds after genetic screening that they arboth heterozygous for alleles responsiblfor that genetic disorder, what is their chancto hava homozygous child?

Accepted Answer

When both parents are heterozygous for an autosomal dominant disorder, there is a 25% chance that their child will inherit two copies of the dominant allele, resulting in a homozygous condition.

Question 17

In a pedigrechart, a femalwho does NOT demonstratthtrait being studieis representeby

Accepted Answer

A clear circle represents a female who does not demonstrate the trait being studied in a pedigree chart.

Question 18

Achondroplasia is an autosomal dominant disorder.If a newly weddecouplfinds after genetic screening that they arboth heterozygous for alleles responsiblfor that genetic disorder, what is their chancto hava heterozygous child?

Accepted Answer

When both parents are heterozygous (Aa) for an autosomal dominant disorder, there is a 50% chance that their child will also be heterozygous (Aa) for the disorder.

Question 19

Queen Victoria

Accepted Answer

Queen Victoria was a carrier of hemophilia, which is a genetic disorder. She did not have hemophilia herself, nor did she have a hemophilic parent. The mutation for hemophilia is believed to have occurred spontaneously in her.

Question 20

In an autosomal disorder such as Huntington's, two carrier parents havthprobability of passing thgenon to __________ percent of their children.

Accepted Answer

The answer of In an autosomal disorder such as Huntington's,...

Quiz 9: Patterns of Inheritance