Genetics exam 2: Inheritance and traits, Evans UARK

Tehya Nash
Quiz by Tehya Nash, updated more than 1 year ago
Tehya Nash
Created by Tehya Nash almost 3 years ago
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Description

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

Resource summary

Question 1

Question
Describe a Barr Body
Answer
  • 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.

Question 2

Question
What is a condensed inactivated X chromosome?
Answer
  • X-linked
  • Y-linked
  • Barr Body

Question 3

Question
How can a female heterozygote phenotypically display a mosaic phenotype?
Answer
  • 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.

Question 4

Question
Tortoiseshell cats are mostly...
Answer
  • Female
  • Male
  • Homozygous
  • Heterozygous
  • Both Female and Heterozygous

Question 5

Question
What's an example of random X-inactivation?
Answer
  • Tortoiseshell pattern
  • Down syndrome
  • Siamese cat

Question 6

Question
What is an example of a reversible epigenetic process?
Answer
  • Y-chromosome activation
  • X-chromosome inactivation
  • Down syndrome

Question 7

Question
What does epigenetic mean?
Answer
  • 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

Question 8

Question
X-inactivation is...
Answer
  • 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.

Question 9

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

Question 10

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

Question 11

Question
What type of traits exhibit sex-dependent inheritance patterns?
Answer
  • X-linked traits
  • Y-linked traits
  • Sex linked traits

Question 12

Question
The white gene in drosophila is...
Answer
  • X linked and is located on the x chromosome
  • Y linked and located on the Y chromosome
  • Sex independent

Question 13

Question
What would you call a diploid individual that carries only one copy of a given gene?
Answer
  • Hemizygous, Hemizygote
  • Heterozygous, Heterozygote
  • Homozygous, Homozygote

Question 14

Question
In XX/XY species, the XY sex is________ for X-linked genes.
Answer
  • Heterozygous
  • Homozygous
  • Hemizygous

Question 15

Question
How would you denote a Wild type white allele?
Answer
  • w-
  • w+
  • w

Question 16

Question
Hemizygosity is phenotypically equivalent to...?
Answer
  • Sex linked
  • Heterozygosity
  • Homozygosity

Question 17

Question
X & Y act as a homologous pair during what?
Answer
  • Mitosis and daughter cell formation
  • Meiosis and gamete formation
  • Meiosis II and gamete formation

Question 18

Question
What is a unique aspect(s) of X-linked inheritance?
Answer
  • 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.

Question 19

Question
What is true about X-linked recessive conditions?
Answer
  • It effects females more often than males.
  • It effects males more often than females.
  • It equally effects males and females both.
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