What is the type of inheritance?

[mensamedlem]

Green = healthy. Pink = sick.

Figure 1: http://www.flickr.com/photos/44610661@N04/4100876940/

Figure 2: http://www.flickr.com/photos/44610661@N04/4100878606/

Figure 3: http://www.flickr.com/photos/44610661@N04/4100881254/

a) Autosomal dominant
b) Auotomal recessive
c) X-linked dominant
d) X-linked recessive

Why?

[mensamedlem]

Figure 1: Autosomal dominant

Figure 2: Autosomal recessive

Figure 3: X-linked recessive

[JackBean]

And half? That's what? Like half-sick? :-/

[mensamedlem]

Half = healthy carrier.

[JackBean]

Why are you asking and answering?

[mensamedlem]

Because I am not sure about the correctness of the answers.

[mensamedlem]

Anyone who can help?

[Darby]

Your answers make sense.

[mensamedlem]

Are my definitions correct?


Figure 1: http://www.flickr.com/photos/44610661@N04/4100876940/

Explanation: It is autosomal dominant. Both sexes transmit the trait to their offspring. Affected offspring must have an affected parent unless they posses a new mutation. Unaffected parents do not transmit the trait.

Figure 2: http://www.flickr.com/photos/44610661@N04/4100878606/

Explanation: It is autosomal recessive. Trait tend to skip generations. Affected offspring are usually born to unaffected parents.

Figure 3: http://www.flickr.com/photos/44610661@N04/4100881254/

Explanation: It is x-linked recessive. Affected sons are usually born to unaffected mothers, thus the trait skips generations. It is never passed from father to son.

[JackBean]

2) if the squere (sorry, don't remember, whether it's man or woman), is recessive homozygote, how that it's children are not carriers?
Unless it's not man and these are actually not his children

[mensamedlem]

Square = man.

[JackBean]

That's not the point The point is, how can his children be healthy, if he has only bad alleles?