Well, there are some unusual circumstances that could in principle make this more likely than usual, such as a "driving Y" segregation distorter on the Y chromosome. And there is evidence that among deer the sex ratio of fawns is influenced by the social status of the mother; something like that might in principle happen among humans. But they are all pretty speculative: I've heard of driving Y genes in mice, but not in humans. Any such extraordinary circumstance is less common than the single-sex sibships that are expected by simple chance.
Remember that if each sex were equally common (in practice boys are born slightly more commonly than girls) then purely by chance you would expect half of all two-child sibships to be all the same sex, a quarter of all three-child sibships, an eighth of all four-child sibships, over 6% of all five-child sibships, and over 3% of all six-child sibships. A family of six or seven siblings all boys or all girls doesn't require any special explanation unless it be shown that such families are more common than you'd expect.
families look the same because they all have genes that are the same...
Siblings look-a-like because they all have the same parents. Siblings don't look identical to their parents, they have variation in their characteristics. The same thing happens with plants and other organisms. Unless you have an identical twin. If you have an identical twin, you both have the exact same characteristics. The cell of identical twins makes an exact same copy with the cell. The process is called 'Embryo'.
Classification systems are all the same are all different vary with the taxonomist
no No. It depends on what type of pollinators the flower is trying to attract. Some are attracted to scents, hence perfumed flowers, and some are attracted to color or shape, which is why flowers come in all colors and shapes.
A blood test will reveal your child's blood group -- siblings do not necessarily all have the same blood type.
No, none of the Cullens are actually siblings. They are all adopted from different families, and at different times.
families look the same because they all have genes that are the same...
Same as all families all over the world!
Yes the dogs recognize their siblings because they all have something same about or on their body
Most single siblings are mean because they are unhappy. They see all these newly forming families and it makes them feel left out so they are mean as a result.
Yes, they all have the same parents.
Yes, if and only if your father marries her :)
Yes, but some of them were half-siblings because her father married twice.
No of course not. To say that all Irish families are big is a huge generalisation. In the past, the average Irish family had five or more children, because there was no contraception, and the role of women etc. Nowadays, the average number of children per family is two. Just like any other western country, some families are large and some are small Personally, I'm Irish, and I only have one sister, but my dad had five siblings and my mam had three. My grandparents had between seven and ten in their families but that is no longer the case.
because they have the same number of electrons in their valence shell / orbitals.
There are millions of Mormon families living all over the world. They aren't all related, nor are their families all from the same place. You can see how diverse Mormons are at Mormon.org/people
The columns represents different families or groups. Some of them have a special name and some are just named the first element in their group. All elements in the same family have similar properties and the same valence number.