why do siblings look so different even though they have same parents?

Question

biologically and genetically speaking. please don't answer "different daddies" like everyone else

Answer 1

First of all siblings do not have identical DNA, they have similar Chromosomal DNA and identical Mitochondrial DNA if they have the same mother. Due to variation all humans have different DNA and each person has alleles from both there father and mother.

In addition, Other factors such as diet, stress, exercise, use of drugs and alcohol, exposure to radiation and chemicals and sunlight or tanning beds, overall physiological and psychological health all affect the way someone looks

Answer 2

Although statistically speaking, siblings should share half of their DNA, genes interact in complex ways, so they may have different developmental components that affect the expression of their shared DNA. Additionally, crossing over during meiosis allows for further randomness in what parts are inherited in each gamete. Basically, though, the complexity in gene expression can allow for the portions of the DNA that are the same to be expressed in different ways.

Answer 3

because upon the division of cells, even though the genetic material form both mom and dad are the same for you and your siblings, the formations of choice are different. so you may take more dominance in one trait than your siblings did. its like a radios graphic equalizer, you have the same options, just that you have chosen a different setting that suits you better.

Answer 4

Different genes and chromosomes. One sibling may get the blue eye gene from their father and the other sibling might get the brown eye gene. It is all a game of chance. Sometimes siblings get similar genes and look nearly identical while other might not.

Answer 5

We're made up of 46 chromosone pairs. You get 23 from Mum and 23 from Dad.
If Dad's contribution for one child is the green eyes - you've got green eyes.
If Mum's contribution is height - you get her genetic background, short or tall.
Next kid gets Dad's height and Mum's blue eyes.
Neither look like each other, but Mum's dad's nose came through on one, etc, etc.
And there are 'dominant' and 'recessive' genes, etc, which complicate matters.

Answer 6

because even though they have the same parents they have different genes well sortof sorry am not the best at explaing this but its like say we have 2 sisters one can get like there mums eyes and the other gets the dads eyes one gets there dads nose there other their mums nose its. its when the featus is being produce it gets its information from the dna (the whole x y xx thing) sorry i know someone will proberly explain it better than me

Answer 7

They get genes from previous family members, like they're dads, dads dad. And so forth. Just the genes differ a little bit.

Answer 8

We inherit certain characteristics from different people in our families. I have brown hair and am shorter, I take after my mom and that side of the family. My brother is blond and almost six feet. He takes after my dad's side. He also has a lot of both of our grandfather's features. It's just what is passed down to us.

Answer 9

Since this dna testing came out, they discovered 8% DO have different Dads

Answer 10

It's genetics one gene over powers the others, look back into your families photos and look at your grand parents and theirs and so forth. My daughter had blond hair for years and green eyes like me, and her father had black hair and brown eyes he was Indian. We divorced and he said she wasn't his because she looked like me, STUPID. My gene factors were stronger, or God choose to design each of us the way he pleased.