Multiple choice hw questions 1. If the sperm cell contributes mitochondria to th
ID: 208729 • Letter: M
Question
Multiple choice hw questions
1.
If the sperm cell contributes mitochondria to the oocyte, it is called
paternal leakage
paternal effect
endosymbiosis
heteroplasmy
genomic imprinting
2.
The current molecular explanation for imprinting in mammals involves differential _______ of various DNA regions.
methylation
phosphorylation
heteroplasmy
endosymbiosis
mutations
3.
Monoallelic expression is associated with which of the following?
Genomic imprinting
Extra nuclear inheritance
X-inactivation
Maternal inheritance
4.
Heteroplasmy is associated with inheritance patterns involving
maternal effect
ribosomes
chloroplasts
nuclear genes
genomic imprinting
5.
Monoallelic expression of a gene:
Is not seen in mammals
Occurs when one copy of the gene carries a mutation
Occurs when the gene is imprinted
Occurs when one copy of the gene has been deleted
paternal leakage
paternal effect
endosymbiosis
heteroplasmy
genomic imprinting
Explanation / Answer
1) The correct option is paternal leakage.
Paternal mtDNA transmission and paternal mtDNA inheritance pass on to the incidence of mitochondrial DNA, which transmit from a father to his offspring.
2) The correct option is methylation.
DNA methylation is a process by which methyl groups are attached to the DNA molecule. This process modify the activity of a DNA segment without any modification in the sequence.
3) The correct option is Genomic imprinting.
Genomic imprinting is an epigenetic modification, which leads to monoallelic expression of some genes. The methylation works in monoallelic expression both in setting the genomic imprint and in modification of the patterns of gene expression.
4) The correct option is chloroplasts.
Heteroplasmy is the presence of more than one such as mitochondrial DNA or plastid DNA within a cell and organism. It is an essential factor, which considers the harshness of mitochondrial diseases.
5) The correct option is Occurs when the gene is imprinted.
Monoallelic expression of a gene occurs when the gene is imprinted.
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