10828100
Description
Quiz by Tehya Nash, updated more than 1 year ago
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Created by Tehya Nash
over 6 years ago
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Question 1
Question
Describe a Barr Body
Answer
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They are intact X chromosomes which are highly condensed and transciptionally repressed.
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They are intact X chromosomes which are lightly condensed and transcriptionally repressed.
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They are intact Y chromosomes which are highly condensed and transcriptionally repressed.
Question 2
Question
What is a condensed inactivated X chromosome?
Answer
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X-linked
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Y-linked
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Barr Body
Question 3
Question
How can a female heterozygote phenotypically display a mosaic phenotype?
Answer
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X-chromosome inactivation can phenotypically cause this for X- linked genes to display a mosaic phenotype.
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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.
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Y-chromosome inactivation can phenotypically cause this for Y- linked genes to display a mosaic phenotype.
Question 4
Question
Tortoiseshell cats are mostly...
Answer
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Female
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Male
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Homozygous
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Heterozygous
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Both Female and Heterozygous
Question 5
Question
What's an example of random X-inactivation?
Answer
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Tortoiseshell pattern
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Down syndrome
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Siamese cat
Question 6
Question
What is an example of a reversible epigenetic process?
Answer
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Y-chromosome activation
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X-chromosome inactivation
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Down syndrome
Question 7
Question
What does epigenetic mean?
Answer
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Not a change in DNA sequence but a change in chromatin state.
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A change in DNA sequence and a change in chromatin state.
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Multiple gene sequences are cut out of the X-inactivation
Question 8
Question
X-inactivation is...
Answer
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Erased during Mitosis, and the chromosome is passed onto the progeny in its original, active state.
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Erased during Meiosis, and the chromosome is passed onto the progeny in an altered state.
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Erased during Meiosis, and the chromosome is passed onto the progeny in its original, active state.
Question 9
Question
If extra X chromosomes are inactivated, why does XXY (Klinefelters) produce a clinical syndrome?
Answer
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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.
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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.
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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.
Question 10
Question
Few genes are shared by both X and Y because...?
Answer
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Genes that are unique to the X chromosome are X-linked genes.
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Genes that are unique to the Y chromosome are Y-linked genes.
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Genes found on the sex chromosomes are sex-linked genes.
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All are correct.
Question 11
Question
What type of traits exhibit sex-dependent inheritance patterns?
Answer
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X-linked traits
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Y-linked traits
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Sex linked traits
Question 12
Question
The white gene in drosophila is...
Answer
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X linked and is located on the x chromosome
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Y linked and located on the Y chromosome
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Sex independent
Question 13
Question
What would you call a diploid individual that carries only one copy of a given gene?
Answer
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Hemizygous, Hemizygote
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Heterozygous, Heterozygote
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Homozygous, Homozygote
Question 14
Question
In XX/XY species, the XY sex is________ for X-linked genes.
Answer
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Heterozygous
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Homozygous
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Hemizygous
Question 15
Question
How would you denote a Wild type white allele?
Answer
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w-
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w+
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w
Question 16
Question
Hemizygosity is phenotypically equivalent to...?
Answer
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Sex linked
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Heterozygosity
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Homozygosity
Question 17
Question
X & Y act as a homologous pair during what?
Answer
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Mitosis and daughter cell formation
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Meiosis and gamete formation
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Meiosis II and gamete formation
Question 18
Question
What is a unique aspect(s) of X-linked inheritance?
Answer
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XY male parents normally cannot pass their X chromosome to male progeny
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A male needs to receive only 1 recessive allele to display the recessive phenotype, but females need to receive 2 recessive alleles.
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A heterozygous female for an X-linked trait can produce sons who display the recessive phenotype, regardless of her mate's X-chromosome genotype.
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X-linked traits often deviate from Mendelian ratios
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All are correct.
Question 19
Question
What is true about X-linked recessive conditions?
Answer
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It effects females more often than males.
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It effects males more often than females.
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It equally effects males and females both.
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