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Who doesn't follow maternal lines as well as paternal lines? Maternal lines are just more difficult to follow, as women are pretty invisible in most records.
No. Everyone has a genome, 50% of which comes from female ancestors and 50% from male ancestors. Genes are extant, present and can be passed on to offspring whether they are dominant or recessive.
Only variance is males have one Y chromosome on one set of pairs, XY male or XX female. All other pairs are XX for both males and females. Only the pair that determines sex is either XY or XX. Clear as mud? Males have 45 of 46 "legs" of gene pairs (in order to have 3 legs ) . Females have 46 of 46.
So human male:
XX XX XX XX XX
XX XX XX XX XX
XX XX XX XX XX
XX XX XX XX XX
XX XX XY
While human female:
XX XX XX XX XX
XX XX XX XX XX
XX XX XX XX XX
XX XX XX XX XX
XX XX XX
No. Everyone has a genome, 50% of which comes from female ancestors and 50% from male ancestors. Genes are extant, present and can be passed on to offspring whether they are dominant or recessive.
Only variance is males have one Y chromosome on one set of pairs, XY male or XX female. All other pairs are XX for both males and females. Only the pair that determines sex is either XY or XX. Clear as mud? Males have 45 of 46 "legs" of gene pairs (in order to have 3 legs ) . Females have 46 of 46.
So human male:
XX XX XX XX XX
XX XX XX XX XX
XX XX XX XX XX
XX XX XX XX XX
XX XX XY
While human female:
XX XX XX XX XX
XX XX XX XX XX
XX XX XX XX XX
XX XX XX XX XX
XX XX XX
I am not sure what you are trying to say here. Humans have 23 pairs of chromosomes. Females have two X chromosomes and males have one X and one Y. For both sexes, the other pairs are numbered from 1 to 22; they are not "XX". Chromosomes 1 to 22 are referred to as autosomes.
Each chromosome is divided into genes. The two chromosomes in a pair have similar genes at the same location. Some are called dominant if their effect will be expressed even if only one gene of a pair codes for the trait. Recessive traits require two copies of the same gene.
Since only males have Y chromosomes, any male's Y must come from his father. That is the whole reason Y-DNA is useful for genealogy - and only for the direct male line.
Mitochondrial DNA is different. It is only inherited from the mother, both for males and females.
Nope. Those are pictures of actual chromosomes. The X and Y refer only to the sex chromosomes.
During meiosis, where the chromosomes exchange genes, they do look like Xs, but the autosomal chromosomes are identified by their numbers, not X or Y. For example, Down syndrome is caused by an extra chromosome 21- trisomy 21.
The point is/was that we all get 50% of our DNA from males and 50% from females. To say otherwise it to say that we don't all have 2 parents, one male and one female, and that they don't likewise have 2 parents of each gender.
I'm no geneticist but I don't think that's correct. Depends on what's dominant or recessive, no?
Well, now that we've had a pleasant stroll down Mendelian Lane (a bit o' humor, dontcha know), lets get back to your issue.
It is true that half of a person's genes come from each parent. Your concern about dominance or recessiveness has to do with whether the gene is actually EXPRESSED in the offspring. For example, the gene for brown eyes is dominant, while the gene for blue eyes is recessive. Let's assume that one parent is from a "purely" brown-eyed line, and that the eye-color gene structure is [BB]. Let's also assume that the other is from a purely blue-eyed line, and that the eye-color gene structure is [bb]. Any offspring inherits one gene from each parent [Bb] and, since the brown-eyed gene is dominant they will all have brown eyes.
Now, let's also assume that this offspring mates with another whose eye-color gene structure is also [Bb]. In this case there is a 75% chance that an offspring will have brown eyes -- the pairings being [BB], [Bb] and [bB]. There is a 25% chance that said offspring will have blue eyes [bb].
Making that our neighbors are experts... on another subject: in my ignorance I would ask what you think about the idea that the human being is only one of the real transport which is the gen that never dies...taking into account that what changes are we, ie our bodies.
The genes are those that continue when we die but ... do they are born, grow, reproduce and die? And are they able to learn?
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) . Females have 46 of 46. 
The point is/was that we all get 50% of our DNA from males and 50% from females. To say otherwise it to say that we don't all have 2 parents, one male and one female, and that they don't likewise have 2 parents of each gender.
