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They cannot be different because when DNA copies, it makes an exact copy of itself. Making it so that the alleles are the same. So it would be impossible for the alleles to be different.

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Q: Why sister chromatids could not have different alleles?
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What could cause the sister chromatids in metaphase 1 not to be identical?

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Why do you use non-sister chromatids to demonstrate crossing over?

Crossing over occurs between homologous chromosomes, which are not identical, as one member of each pair of homologous chromosomes comes from the mother, and one member comes from the father. Sister chromatids are identical and crossing over would have no effect.


Similarities between Homologous chromosomes and sister chromatids?

Homologous chromosomes are two sister chomatids stuck together with cohesins forming a tetrad. They have the same genes but not necissarily the same alleles, so they could carry hair color, one with brown the other with blonde. So, homologous chromosomes share the same gene.


Is ABO blood group determined by multiple alleles?

* Type A alleles could be : IAIA or IAi* Type B alleles could be : IBIB or IBi* Type AB alleles : IAIB* Type O alleles : ii


What does it mean if there is two different alleles for a trait?

The trait could show up in two different forms. Alleles are individual units that determine what trait will be expressed in an offspring. Alleles exist for most traits such as hair color or wing size. Having two alleles simply means that the trait can be expressed in different variation. One trait can have several different alleles.


What has two identical alleles for a trait?

A heterozygote is an organism with two different alleles for a trait.


What does it mean if there are 2 different alleles for a trait?

A Trait Could Show Up In Two Different Forms


Are alleles different forms of a gene?

No, alleles are different forms of a gene. The gene is the portion of DNA/RNA that codes for a particular trait (chain of proteins). The alleles are the possible code bits that could be in that part of the DNA and different alleles will result in different traits being expressed. E.g., part of your DNA codes for your eye color, and in that part there are a number of different alleles that could be there. A certain allele might make you blue-eyed, while another would make you brown-eyed, etc. This is something of a simplification as many traits are expressed via multiple alleles, but that is the general idea.


What term is used when both alleles are different?

The condition called in a case when you have a two different types of alleles is called as Heterozygous and when this is exactly the opposite that is when it has the alleles for the same source we describe such a condition as a Homozygous. This two terms are of most importance when you take the genetics


Symbol for sister?

You could use a great many different symbols to represent sister. You could use a daisy for example to represent a sister.


Different types of bloods and their description?

1-Type A ... which has antibodies : B ... and Antigene : A2-Type B ... which has antibodies : A ... and Antigen : B3-Type AB . which has No antibodies ... and has Antigen : A and B4-Type O .. which has antibodies : A and B ... and has No Antigens* Type A alleles could be : IAIA or IAi* Type B alleles could be : IBIB or IBi* Type AB alleles : IAIB* Type O alleles : ii


Different types of bloods and description?

1-Type A ... which has antibodies : B ... and Antigene : A2-Type B ... which has antibodies : A ... and Antigen : B3-Type AB . which has No antibodies ... and has Antigen : A and B4-Type O .. which has antibodies : A and B ... and has No Antigens* Type A alleles could be : IAIA or IAi* Type B alleles could be : IBIB or IBi* Type AB alleles : IAIB* Type O alleles : ii