am i adopted because i dont have my parents hair color

Your hair color doesn't necessarily come from your parents, it could be from your grandparents or great grandparents or so on

What is the rarest gene

if your asking "What is the rarest gene", just look it up on google, but its KAT6A syndrome

why do they get down syndrome.

If they have an extra chromosome 21 it causes down syndrome

Is it possible for human offspring to only get 10% of the genes from their parents?

Yes... but only due to a HUUGE mutation. Just a 2% differentiation in gene structure can create a whole new species. Hope this helps.

Also,why is the last pair of chromosomes in the picture labeled "X"? Why didn't they just number it 23?

it is the human sex chromosomes so it determines your sex boy or girl. for more info go to lesson 4:Reproduction and genetic variation

Why do they have different alleles, or versions, of those genes?

"During meiosis, homologous chromosomes line up and recombination occurs between them. This results in gametes with unique combinations of alleles on each chromosome and therefore unique individuals."

why are they green and red?

That's just how they look under an X-ray.

Main content

Course: Middle school biology - NGSS > Unit 7

Lesson 1: Chromosomes

Chromosome pairs

Google Classroom

Review your understanding of chromosome pairs in this free article aligned to NGSS standards.

Key points:

Every species has its own specific number of chromosomes. For example, humans have 46 chromosomes in a typical body cell.
Many species have chromosomes that come in matched pairs. For example, the 46 chromosomes in a human cell can be organized into 23 pairs.
These paired chromosomes are called homologous chromosomes. Homologous chromosomes are the same size and shape.
Homologous chromosomes contain the same genes. However, they may have different alleles, or versions, of those genes.
Scientists and medical professionals can use a karyotype to view an organism’s sets of chromosomes. In a karyotype, pairs of homologous chromosomes are arranged next to each other. This makes it easier to see if there are any differences between chromosomes that may lead to a genetic condition.

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am i adopted because i dont have my parents hair color
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owen.junck
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why do they get down syndrome.
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- SomewhatSadit
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  If they have an extra chromosome 21 it causes down syndrome
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Is it possible for human offspring to only get 10% of the genes from their parents?
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- Tyler
  Posted a year ago. Direct link to Tyler's post “Yes... but only due to a ...”
  Yes... but only due to a HUUGE mutation.
  Just a 2% differentiation in gene structure can create a whole new species.
  Hope this helps.
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Tiara Forbes
Posted 7 months ago. Direct link to Tiara Forbes's post “Also,why is the last pair...”
Also,why is the last pair of chromosomes in the picture labeled "X"? Why didn't they just number it 23?
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- Peril14 [online]🐉
  Posted 7 months ago. Direct link to Peril14 [online]🐉's post “it is the human sex chrom...”
  it is the human sex chromosomes so it determines your sex boy or girl. for more info go to lesson 4:Reproduction and genetic variation
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27kimchri
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What is the rarest gene
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- AshtonL
  Posted 3 months ago. Direct link to AshtonL's post “if your asking "What is t...”
  if your asking "What is the rarest gene", just look it up on google, but its KAT6A syndrome
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joshua wolford
Posted 2 years ago. Direct link to joshua wolford's post “Why do they have differen...”
Why do they have different alleles, or versions, of those genes?
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- jenna renes
  Posted 2 years ago. Direct link to jenna renes's post “"During meiosis, homologo...”
  "During meiosis, homologous chromosomes line up and recombination occurs between them. This results in gametes with unique combinations of alleles on each chromosome and therefore unique individuals."
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IsabellaG
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why are they green and red?
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- Adonalsium
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  That's just how they look under an X-ray.
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Wolfy
Posted 2 years ago. Direct link to Wolfy's post “The reason why they look ...”
The reason why they look odd is because of the light they are looking at the chromosomes under, think about when they take an X-Ray of a bone, everything becomes black and white.
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