Tehya Nash
Quiz por , criado more than 1 year ago

Genetics Quiz sobre Genetics exam 2: Inheritance and traits, Evans UARK, criado por Tehya Nash em 11-10-2017.

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Tehya Nash
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Genetics exam 2: Inheritance and traits, Evans UARK

Questão 1 de 19

1

Describe a Barr Body

Selecione uma das seguintes:

  • 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.

Explicação

Questão 2 de 19

1

What is a condensed inactivated X chromosome?

Selecione uma das seguintes:

  • X-linked

  • Y-linked

  • Barr Body

Explicação

Questão 3 de 19

1

How can a female heterozygote phenotypically display a mosaic phenotype?

Selecione uma das seguintes:

  • 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.

Explicação

Questão 4 de 19

1

Tortoiseshell cats are mostly...

Selecione uma das seguintes:

  • Female

  • Male

  • Homozygous

  • Heterozygous

  • Both Female and Heterozygous

Explicação

Questão 5 de 19

1

What's an example of random X-inactivation?

Selecione uma das seguintes:

  • Tortoiseshell pattern

  • Down syndrome

  • Siamese cat

Explicação

Questão 6 de 19

1

What is an example of a reversible epigenetic process?

Selecione uma das seguintes:

  • Y-chromosome activation

  • X-chromosome inactivation

  • Down syndrome

Explicação

Questão 7 de 19

1

What does epigenetic mean?

Selecione uma das seguintes:

  • 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

Explicação

Questão 8 de 19

1

X-inactivation is...

Selecione uma das seguintes:

  • 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.

Explicação

Questão 9 de 19

1

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

Selecione uma das seguintes:

  • 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.

Explicação

Questão 10 de 19

1

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

Selecione uma das seguintes:

  • 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.

Explicação

Questão 11 de 19

1

What type of traits exhibit sex-dependent inheritance patterns?

Selecione uma das seguintes:

  • X-linked traits

  • Y-linked traits

  • Sex linked traits

Explicação

Questão 12 de 19

1

The white gene in drosophila is...

Selecione uma das seguintes:

  • X linked and is located on the x chromosome

  • Y linked and located on the Y chromosome

  • Sex independent

Explicação

Questão 13 de 19

1

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

Selecione uma das seguintes:

  • Hemizygous, Hemizygote

  • Heterozygous, Heterozygote

  • Homozygous, Homozygote

Explicação

Questão 14 de 19

1

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

Selecione uma das seguintes:

  • Heterozygous

  • Homozygous

  • Hemizygous

Explicação

Questão 15 de 19

1

How would you denote a Wild type white allele?

Selecione uma das seguintes:

  • w-

  • w+

  • w

Explicação

Questão 16 de 19

1

Hemizygosity is phenotypically equivalent to...?

Selecione uma das seguintes:

  • Sex linked

  • Heterozygosity

  • Homozygosity

Explicação

Questão 17 de 19

1

X & Y act as a homologous pair during what?

Selecione uma das seguintes:

  • Mitosis and daughter cell formation

  • Meiosis and gamete formation

  • Meiosis II and gamete formation

Explicação

Questão 18 de 19

1

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

Selecione uma das seguintes:

  • 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.

Explicação

Questão 19 de 19

1

What is true about X-linked recessive conditions?

Selecione uma das seguintes:

  • It effects females more often than males.

  • It effects males more often than females.

  • It equally effects males and females both.

Explicação