How do you tell whether two genes are linked based on the phenotypic results of offspring...

How do you tell whether two genes are linked based on the phenotypic results of offspring from a dihybrid cross?
1. If the genes are linked, certain combinations of phenotypes will not be observed as often among the offspring of a dihybrid cross
2. If the two genes are on different chromosomes, all the offspring will look like the parents
3. Linked genes will result in mutations being expressed only in male offspring
4. Ifthegenesarenotlinked, you may calculate offspring ratios using Punnett squares
5. If the genes are linked, only one version of each trait is inherited

Solutions

Expert Solution

You can tell whether two genes are linked based on the phenotypic results of offspring from a dihybrid cross if:

If the genes are linked, certain combinations of phenotypes will not be observed as often among the offspring of a dihybrid cross

If the genes are not linked, you may calculate offspring ratios using Punnett squares

Explanation- when two or more genes reside on the same chromosome, they tend to remain together and do not exhibit independent assortment, they are said to be linked. If the genes are linked, certain combinations of phenotypes will not be observed as often among the offspring of a dihybrid cross. Linked genes only show parental types and no recombinant types in their offspring during complete linkage.

If two genes are not linked that means they are unlinked. Unlinked genes assort independently of one another during the formation of gametes according to the Mendel's law of independent assortment. So you can calculate the offspring ratio using Punnet square.

If the two genes are on different chromosomes (unlinked genes) 50% of offspring will look like parents and 50% will not (Recombinant).

Linked genes will tend to be inherited as a pair more often than not. This phenomenon is called genetic linkage

gladiator answered 1 year ago

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