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2 years ago

A cross between two individuals that are heterozygous for eye and skin color would be an example of a _____ cross.

1 answer:

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A cross between individuals that are heter0zyg0us for two different traits is a dihybrid cross. A cross between two individuals that are heterozygous for eye and skin color would be an example of a _dihybrid_ cross.

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Dihybrid crosses involve individuals that expresses two different traits and are heter0zyg0us for each of them.

So let us imagine we are studing the characters eye color and skin color. Let us assume that both of them are coded by single diallelic genes.

For eye color there is

Dominant allele B that codes for brown eyes
Recessive allele b that codes for blue eyes

For skin color there is

Dominant allele A that codes for black skin
Recessive allele a that codes for white skin

So, an individual that is heter0zyg0us for both of them, is BbAa.

If this person crosses to another person with the same genotype, we are talking about a dihybrid cross, because two dibybrid individuals are involved.

Cross: BbAa x BbAa

According to this information, we can aswer the question:

When crossing two individuals that are heterozygous for eye and skin color we are referring to a dihybrid cross.

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Learn more about dihybrid crosses at

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Explanation:

This is a typical dihybrid cross involving two genes, one coding for fruit taste and the other for spot color. The allele for bitter taste (B) and yellow spot (S) is dominant over the allele for sweet taste (b) and no spot (s) respectively.

Hence, a heterozygous F1 resulting from a cross between an homozygous dominant (bitter fruit, yellow spot) and homozygous recessive (sweet fruit, no spot) will have a BbSs genotype. The heterozygous F1 offsprings are self-crossed and produce gametes BS, Bs, bS, bs. (See punnet square). The F2 offsprings will have the following phenotypes: Bitter fruit, yellow spot (9)

Bitter fruit, no spot (3)

Sweet fruit, yellow spot (3)

Sweet fruit, no spot (1)

Back cross between a F1 offspring (BbSs) and homozygous dominant parent (BBSS) will produce all bitter fruit, yellow spot offsprings (see attached image). BBSS (4), BBSs (4), BbSS (4), and BbSs (4) are the offsprings' genotypes.

For the back cross between a F1 offspring (BbSs) and a homozygous recessive (bbss) parent, the Phenotypes with their proportions are as follows:

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Sweet fruit, no spot (bbss, 4).

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