Could someone explain why in patterns of inheritance genes on the same chromosome behave differently than genes on a different chromosome? And how were chromosomes initially mapped and what does crossing over have to do with such mapping?

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Patrina SchowalterLv2

28 Sep 2019

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Related questions

The syntenic genes A and Z are linked. A cross between two parents, AAzz and aaZZ, produces F₁ progeny with the AaZz genotype. What are the possible arrangements of alleles on the F₁ progeny's chromosomes?

A/Z or a/z

The answer is not AZ/az

Genes that are on the same chromosome can assort independently when

they are very close together on a chromosome and crossing over occurs rarely between the genes.

they are far apart on a chromosome and crossing over occurs rarely between the genes.

they are far apart on a chromosome and crossing over occurs frequently between the genes.

they are syntenic.

Genes on the same chromosome cannot assort independently.

Please help me with these two!

For genetics:

how do we parental classes in meiosis come about ? Is there no recombination or crossing over occurring? But in my textbook it says that if recombination did not occur, nondisjunction during meiosis I would be a common, rather than a rare occurrence, and species could not retain the same number of chromosomes in successive generations.

I am confused on how linked genes have more parental types than recombination types, i understand that the linked genes are inherited together because they are close together on the same chromosome.

I guess my question is, do all chromosomes undergo recombination and crossing over in meiosis? And the parental classes are parental because were just looking for those certain linked genes that are inherited together?

thank you!