Questions tagged [zygosity]

This tag relates to conjugation, or to the zygote, as (a) the state of a cell or individual in regard to the alleles determining a specific character, whether identical (homozygosity) or different (heterozygosity); or (b) in the case of twins, whether developing from one zygote (monozygosity) or two (dizygosity).

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What is the latest possible point during a pregnancy when a fetus can merge with another fetus?

Background A Chimera is an organism that is composed of two or more zygotes. There are several documented incidences of this happening in humans as shown in the cited link. Since chimeras primarily ...
isakbob's user avatar
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How can drone bees be born from unfertilized eggs?

I am learning about Drone bees and I keep reading that they are born from unfertilized eggs. Now here is my question: if eggs are gametes and therefore reproductive cells, how can they turn into a new ...
Federico Gentile's user avatar
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How can a homozygous mutation, considered pathogenic, occur on a gene such as HFE without the disease developing?

What happens when you have a homozygous mutation on a gene (eg. a swapped base), that is considered pathogenic, but without developing the disease? It it were a heterozygous mutation I would get it, ...
PedroD's user avatar
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ELI5 what is true breeding?

In "Variation under Domestication", Darwin makes several references to the concept of true breeding: They believe that every race which breeds true, let the distinctive characters be ever so slight,...
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Zygosity and Strands

I am not a biology expert but I have done some homework on understanding alleles, chromosomes, dna in the human genome. Still baffled by a question though: As I understand it at a particular locus ...
HakunaMaData's user avatar
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Would a complete lack of heterozygotes in a population indicate the presence of a recessive allele?

This doesn't instantly make sense to me. Lets say you have 100 people from a subpopulation who were sequenced and aligned to a reference genome. For certain variants, people were either homozygous ...
eugheugh's user avatar
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Is it fair to say that the majority of alleles of a typical diploid organism are homologous at each locus?

I'm trying to get an overview of when zygosity actually comes to bear in regard to the entire genome, the following statement represents my understanding so far... In a typical diploid organism, ...
the_velour_fog's user avatar
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Does zygosity have meaning for mitochondrial variants?

I am working on a system that annotates variants in human DNA sequences. One of the pieces of information reported is the zygosity of the variant. I noticed that mitochondrial variants are also shown ...
terdon's user avatar
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