Genetics exam 2: Inheritance and traits, Evans UARK

Question 1 of 19

1

Describe a Barr Body

Select one of the following:

They are intact X chromosomes which are highly condensed and transciptionally repressed.
They are intact X chromosomes which are lightly condensed and transcriptionally repressed.
They are intact Y chromosomes which are highly condensed and transcriptionally repressed.

Explanation

Question 2 of 19

1

What is a condensed inactivated X chromosome?

Select one of the following:

X-linked
Y-linked
Barr Body

Explanation

Question 3 of 19

1

How can a female heterozygote phenotypically display a mosaic phenotype?

Select one of the following:

X-chromosome inactivation can phenotypically cause this for X- linked genes to display a mosaic phenotype.
X-chromosome inactivation can phenotypically cause this for X- linked genes to display a mosaic phenotype. This can also occur in males with a XXY genotype.
Y-chromosome inactivation can phenotypically cause this for Y- linked genes to display a mosaic phenotype.

Explanation

Question 4 of 19

1

Tortoiseshell cats are mostly...

Select one of the following:

Female
Male
Homozygous
Heterozygous
Both Female and Heterozygous

Explanation

Question 5 of 19

1

What's an example of random X-inactivation?

Select one of the following:

Tortoiseshell pattern
Down syndrome
Siamese cat

Explanation

Question 6 of 19

1

What is an example of a reversible epigenetic process?

Select one of the following:

Y-chromosome activation
X-chromosome inactivation
Down syndrome

Explanation

Question 7 of 19

1

What does epigenetic mean?

Select one of the following:

Not a change in DNA sequence but a change in chromatin state.
A change in DNA sequence and a change in chromatin state.
Multiple gene sequences are cut out of the X-inactivation

Explanation

Question 8 of 19

1

X-inactivation is...

Select one of the following:

Erased during Mitosis, and the chromosome is passed onto the progeny in its original, active state.
Erased during Meiosis, and the chromosome is passed onto the progeny in an altered state.
Erased during Meiosis, and the chromosome is passed onto the progeny in its original, active state.

Explanation

Question 9 of 19

1

If extra X chromosomes are inactivated, why does XXY (Klinefelters) produce a clinical syndrome?

Select one of the following:

Up to 25% of some x-linked genes in humans escape inactivation. This includes the genes within the pseudoautosomal regions (PARs) of the Y chromosomes.
Up to 75% of some x-linked genes in humans escape inactivation. This includes the genes within the pseudoautosomal regions (PARs) of the X and Y chromosomes.
Up to 25% of some x-linked genes in humans escape inactivation. This includes the genes within the pseudoautosomal regions (PARs) of the X and Y chromosomes.

Explanation

Question 10 of 19

1

Few genes are shared by both X and Y because...?

Select one of the following:

Genes that are unique to the X chromosome are X-linked genes.
Genes that are unique to the Y chromosome are Y-linked genes.
Genes found on the sex chromosomes are sex-linked genes.
All are correct.

Explanation

Question 11 of 19

1

What type of traits exhibit sex-dependent inheritance patterns?

Select one of the following:

X-linked traits
Y-linked traits
Sex linked traits

Explanation

Question 12 of 19

1

The white gene in drosophila is...

Select one of the following:

X linked and is located on the x chromosome
Y linked and located on the Y chromosome
Sex independent

Explanation

Question 13 of 19

1

What would you call a diploid individual that carries only one copy of a given gene?

Select one of the following:

Hemizygous, Hemizygote
Heterozygous, Heterozygote
Homozygous, Homozygote

Explanation

Question 14 of 19

1

In XX/XY species, the XY sex is________ for X-linked genes.

Select one of the following:

Heterozygous
Homozygous
Hemizygous

Explanation

Question 15 of 19

1

How would you denote a Wild type white allele?

Select one of the following:

w-
w+
w

Explanation

Question 16 of 19

1

Hemizygosity is phenotypically equivalent to...?

Select one of the following:

Sex linked
Heterozygosity
Homozygosity

Explanation

Question 17 of 19

1

X & Y act as a homologous pair during what?

Select one of the following:

Mitosis and daughter cell formation
Meiosis and gamete formation
Meiosis II and gamete formation

Explanation

Question 18 of 19

1

What is a unique aspect(s) of X-linked inheritance?

Select one of the following:

XY male parents normally cannot pass their X chromosome to male progeny
A male needs to receive only 1 recessive allele to display the recessive phenotype, but females need to receive 2 recessive alleles.
A heterozygous female for an X-linked trait can produce sons who display the recessive phenotype, regardless of her mate's X-chromosome genotype.
X-linked traits often deviate from Mendelian ratios
All are correct.

	Created by Tehya Nash about 7 years ago

Genetics Quiz on Genetics exam 2: Inheritance and traits, Evans UARK, created by Tehya Nash on 11/10/2017.

Genetics exam 2: Inheritance and traits, Evans UARK

Question 1 of 19

Describe a Barr Body

Select one of the following:

Explanation

Question 2 of 19

What is a condensed inactivated X chromosome?

Select one of the following:

Explanation

Question 3 of 19

How can a female heterozygote phenotypically display a mosaic phenotype?

Select one of the following:

Explanation

Question 4 of 19

Tortoiseshell cats are mostly...

Select one of the following:

Explanation

Question 5 of 19

What's an example of random X-inactivation?

Select one of the following:

Explanation

Question 6 of 19

What is an example of a reversible epigenetic process?

Select one of the following:

Explanation

Question 7 of 19

What does epigenetic mean?

Select one of the following:

Explanation

Question 8 of 19

X-inactivation is...

Select one of the following:

Explanation

Question 9 of 19

If extra X chromosomes are inactivated, why does XXY (Klinefelters) produce a clinical syndrome?

Select one of the following:

Explanation

Question 10 of 19

Few genes are shared by both X and Y because...?

Select one of the following:

Explanation

Question 11 of 19

What type of traits exhibit sex-dependent inheritance patterns?

Select one of the following:

Explanation

Question 12 of 19

The white gene in drosophila is...

Select one of the following:

Explanation

Question 13 of 19

What would you call a diploid individual that carries only one copy of a given gene?

Select one of the following:

Explanation

Question 14 of 19

In XX/XY species, the XY sex is________ for X-linked genes.

Select one of the following:

Explanation

Question 15 of 19

How would you denote a Wild type white allele?

Select one of the following:

Explanation

Question 16 of 19

Hemizygosity is phenotypically equivalent to...?

Select one of the following:

Explanation

Question 17 of 19

X & Y act as a homologous pair during what?

Select one of the following:

Explanation

Question 18 of 19

What is a unique aspect(s) of X-linked inheritance?

Select one of the following:

Explanation

Question 19 of 19

What is true about X-linked recessive conditions?

Select one of the following:

Explanation