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Genetics exam 2: Inheritance and traits, Evans UARK
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Preguntas del test (19)
1Describe a Barr Body
- AThey are intact X chromosomes which are highly condensed and transciptionally repressed.
- BThey are intact X chromosomes which are lightly condensed and transcriptionally repressed.
- CThey are intact Y chromosomes which are highly condensed and transcriptionally repressed.
2What is a condensed inactivated X chromosome?
- AX-linked
- BY-linked
- CBarr Body
3How can a female heterozygote phenotypically display a mosaic phenotype?
- AX-chromosome inactivation can phenotypically cause this for X- linked genes to display a mosaic phenotype.
- BX-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.
- CY-chromosome inactivation can phenotypically cause this for Y- linked genes to display a mosaic phenotype.
4Tortoiseshell cats are mostly...
- AFemale
- BMale
- CHomozygous
- DHeterozygous
- EBoth Female and Heterozygous
5What's an example of random X-inactivation?
- ATortoiseshell pattern
- BDown syndrome
- CSiamese cat
6What is an example of a reversible epigenetic process?
- AY-chromosome activation
- BX-chromosome inactivation
- CDown syndrome
7What does epigenetic mean?
- ANot a change in DNA sequence but a change in chromatin state.
- BA change in DNA sequence and a change in chromatin state.
- CMultiple gene sequences are cut out of the X-inactivation
8X-inactivation is...
- AErased during Mitosis, and the chromosome is passed onto the progeny in its original, active state.
- BErased during Meiosis, and the chromosome is passed onto the progeny in an altered state.
- CErased during Meiosis, and the chromosome is passed onto the progeny in its original, active state.
9If extra X chromosomes are inactivated, why does XXY (Klinefelters) produce a clinical syndrome?
- AUp to 25% of some x-linked genes in humans escape inactivation. This includes the genes within the pseudoautosomal regions (PARs) of the Y chromosomes.
- BUp 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.
- CUp 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.
10Few genes are shared by both X and Y because...?
- AGenes that are unique to the X chromosome are X-linked genes.
- BGenes that are unique to the Y chromosome are Y-linked genes.
- CGenes found on the sex chromosomes are sex-linked genes.
- DAll are correct.
11What type of traits exhibit sex-dependent inheritance patterns?
- AX-linked traits
- BY-linked traits
- CSex linked traits
12The white gene in drosophila is...
- AX linked and is located on the x chromosome
- BY linked and located on the Y chromosome
- CSex independent
13What would you call a diploid individual that carries only one copy of a given gene?
- AHemizygous, Hemizygote
- BHeterozygous, Heterozygote
- CHomozygous, Homozygote
14In XX/XY species, the XY sex is________ for X-linked genes.
- AHeterozygous
- BHomozygous
- CHemizygous
15How would you denote a Wild type white allele?
- Aw-
- Bw+
- Cw
16Hemizygosity is phenotypically equivalent to...?
- ASex linked
- BHeterozygosity
- CHomozygosity
17X & Y act as a homologous pair during what?
- AMitosis and daughter cell formation
- BMeiosis and gamete formation
- CMeiosis II and gamete formation
18What is a unique aspect(s) of X-linked inheritance?
- AXY male parents normally cannot pass their X chromosome to male progeny
- BA male needs to receive only 1 recessive allele to display the recessive phenotype, but females need to receive 2 recessive alleles.
- CA heterozygous female for an X-linked trait can produce sons who display the recessive phenotype, regardless of her mate's X-chromosome genotype.
- DX-linked traits often deviate from Mendelian ratios
- EAll are correct.
19What is true about X-linked recessive conditions?
- AIt effects females more often than males.
- BIt effects males more often than females.
- CIt equally effects males and females both.
Información
- Descripción
- Genetics Test sobre Genetics exam 2: Inheritance and traits, Evans UARK, creado por Tehya Nash el 11/10/2017.
- Autor
- Tehya Nash
- Idioma
- English
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