Is it possible for Michael and Danielle to have a child who has type O blood? How do you know this?
Was a switch made at the hospital? Explain your reasoning.
How could fraternal twins be as different in appearance as Michelle and Michael, Jr., including one having light skin and the other having dark skin?

Question

12-02-2017
Biology

contestada

Is it possible for Michael and Danielle to have a child who has type O blood? How do you know this?
Was a switch made at the hospital? Explain your reasoning.
How could fraternal twins be as different in appearance as Michelle and Michael, Jr., including one having light skin and the other having dark skin?

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marianaegarciaperedo marianaegarciaperedo · Answer 1 · 2022-02-08T15:28:56+01:00

YES, Michael and Danielle can have a child who has type O blood ONLY if both of them carry the recessive allele i. Michelle and Michael, Jr. look different from each other because they developed from different fecundated eggs.

Note: I do not have the parental's genotypes, so I will provide the options.

Let us first reveiw a few concepts about blood type.

Blood type: ABO group

The blood type of a person is coded by the I gene. This is a three allelic gene -IA, IB, i-. I allele is dominant over the recessive i allele.

IA is dominant over i. The person presents A type of antigens.

IB is dominant over i. The person presents B type of antigens.

IA and IB are codominant. The person presents both types of antigens, A and B.

i is the recessive allele. The person does not present any antigen.

Phenotypes and Genotypes

A blood type ⇒ H0m0zyg0us dominant or heter0zyg0us Individuals IAIA or IAi.

B blood type ⇒ H0m0zyg0us dominant or heter0zyg0us Individuals IBIB or IBi.

0 blood type ⇒ H0m0zyg0us recessive genotype, ii.

AB blood type ⇒ Individuals carrying IA and IB alleles, IAIB.

According to this framework, it is only possible for Michael and Danielle to have a child who has type O blood if they are heter0zyg0us carrying the i recessive allele.

Option 1:

Parentals) IAi x IAi

F1) 1/4 = 25% IAIA ⇒ type A blood

2/4 = 50% IAi ⇒ type A blood

1/4 = 25% ii ⇒ type 0 blood

Option 2:

Parentals) IAi x IBi

F1) 1/4 = 25% IAIB ⇒ type A blood

1/4 = 25% IAi ⇒ type A blood

1/4 = 25% IBi ⇒ type B blood

1/4 = 25% ii ⇒ type 0 blood

Option 3:

Parentals) IBi x IBi

F1) 1/4 = 25% IBIB ⇒ type B blood

2/4 = 50% IBi ⇒ type B blood

1/4 = 25% ii ⇒ type 0 blood

So yes, Michael and Danielle can have a child who has type O blood ONLY if both of them carry the recessive allele i.

Fraternal Twins

Fraternal twins develop from different separated fertilized eggs.

Their genetic charges might differ according to

How crossing over and independent segregation occurred during meiosis in each of the gametes.

The combination that results from fertilization.

Genetically and phenotypically speaking, fraternal twins are not equal to each other as identical twins are. They can express many differences that make them look like ordinary siblings.

If Michelle and Michael, Jr. look different from each other, it is because they are not identical twins. They are fraternal twins developed from different fecundated eggs.

You can learn more about the ABO group and fraternal twins at

https://brainly.com/question/15822047

https://brainly.com/question/5138305

https://brainly.com/question/1015321

https://brainly.com/question/986349