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3 years ago

In peas, the color yellow (Y) is dominant to the color green (y). How many of the four possible outcomes are yellow?

Biology

2 answers:

pantera1 [17]3 years ago

7 0

It depends on the situations. In the first situation, a Yy gene crosses with a Yy gene. 3 out of 4 of the outcomes have a capital Y in them, meaning that they have a dominant yellow allele. The bottom-right box has two lower-case y's, so it will be green. In the second situation, a YY gene crosses with a Yy gene. Here, all 4 out of 4 of the outcomes have at least one capital Y, so they will all be yellow. Hope that helps!

Anika [276]3 years ago

5 0

Because in order to be yellow the only 2 alleles you can have are the 2

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The only people with Rh negative blood are people who have inherited two recessive alleles for this trait. But some people who a

zubka84 [21]

The difference is due to the inheritance pattern. Blood type needs two recessive alleles to express Rh-. Color-blindness needs only one.

<h3>What are the blood type and Color-blindness inheritance patterns?</h3>

⇒ Blood type is coded by a diallelic Rh gene that expresses complete dominance.

The allele Rh+ dominates over the allele Rh-.

Genotyopes and Phenotypes are as follows,

Individuals Rh+Rh+ express the possitive phenotype

Individuals Rh+Rh- express the possitive phenotype

Individuals Rh-Rh- express the negative phenotype.

To express Rh-, a person must inherit<u> two</u><u> recessive alleles</u> from their parents.

⇒ Color-blindness is an X-linked condition coded by a recessive allele.

As most sex-linked genes, it is transmitted together with the X chromosome.

The phenotype depends on the number of recessive alleles and the sex of the person.

Genotyopes and Phenotypes are as follows,

X⁺X⁺ women have normal sight.

X⁻X⁻ women are completely color-blinded

X⁺X⁻ women are partially color-blinded.

X⁺Y Men are not color-blinded

X⁻Y Men are color blinded.

In this case, only one recessive allele is enough to express the affection.

In conclusion, Blood type needs two recessive alleles to express Rh-. Color-blindness needs only one recessive allele.

You can learn more about the inheritance pattern at

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