Term
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Definition
| The ovum's cytoplama contains genetic and epigentic material, organalles such as ribosomes and mitochondria and mRNA as well as other proteins that do influence the expression of zygotic DNA |
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Term
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Definition
Ummm.....
????
An egg is fertilized==zygote which is the produce of two gametes, cleavage occurs and an embryo ensues... eventually it becomes a fetus.. then a baby... then a toddler, kid, pre-teen, teen, young adult, adult... third age (senile)... death... ???? |
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Term
| Spermatogenesis vs Oogenesis |
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Definition
Spermatogenesis leads to the production of 4 sperm in 74 days, while oogenesis leads to the production of 1 ovum whose production cycle takes 30 years...
No wonder chromosomal mutations/damage is more likely to be maternal... a lot more time for errors to occur... |
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Definition
see spermagenesis and oogenesis... duh...
??? |
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Term
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Definition
birds and bees... after male and female coopulate... sperm and egg combine... the haplotype gametes form a diploid zygote that can then generate life..etc.
occurs after ovulation, in the oviduct |
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Term
| Maternal Zygotic Control of gene expression |
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Definition
| for the first 24 hours after fertilization... the maternal epigenetic material/enzymes/proteins have vast control of the zygotic genetic function/protein synthesis. |
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Term
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Definition
| DNA is tightly packed into chromatin... The DNA wraps itself around histones... compact |
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Term
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Definition
| time-dependent mechanism in fertilized embryos that wait for ZGA until full mRNA synthesis controlled by itself can occur |
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Term
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Definition
ZGA... occurs in two phases (first around 24 hours post fertilization)
It is when zygote gains full controll of its own protein production and expression of own genes through own methods
late ZGA occurs in later phases of 2 cell embryo |
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Term
| Genomic imprinting/imprinting genes |
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Definition
| It is the silencing of genes according to parental origin. It results in a departure of mendelian inheritance. Silencing occurs due to epigenetic manipulation such as methylatio/acytylation. MRNA and proteins present in the ovum may be critical for establishing maternal and paternal imprints. |
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Term
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Definition
| Along the ovum cytoplasma are included mitochondria which contain pieces of its own DNA... Hence most of the inheritence of this DNA is maternal. This also means that there are conditions associated with the inheritance of defective/damaged mitochondrial DNA from mother, influincing metabolic disorders. |
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