Hemophilia is caused by an x-linked recessive mutation in humans. if a woman whose paternal uncle (fathers brother) was a hemophiliac marries a man whose brother is also a hemophillac, what is the probability of their first child having hemophilia (note: assume that there are no other cases of hemophila in the pedigree and no hidden carriers)? select one: o a. 1/2 o b. 1/8 o c.0 o d. 1/4 o e. 1

c. 0

Explanation:

The probability of their first child having hemophilia is 0.

Since hemophilia is is an X-linked and recessive, a man will either be affected or not affected while a woman can be affected, unaffected or be a carrier of the disease.

If the paternal uncle (not the father) of a woman is hemophilic and there is no history of the disorder in the woman's mother's family, such woman is unaffected for the disorder. Hence, her genotype will be (assumming the allele for hemophilia is represented by h).

A man whose brother is hemophilic without himself being hemophilic will have the genotype .

Crossin the two in marriage:

  x  

progeny:

None of the progeny will have hemophilia.

Hence, the probability of their first child having hemophilia is 0.

The correct option is c.

d concave shape of wave rock

explanation:

the concave shape of wave rock is a very good evidence that supports the evolution of earth due to chemical weathering. if we talk about structure of   wave rock, studies have estimated that it is around 2.7 billion years old. it also serves as the foundation of evidence that it was the place where australian continent began to form.

how the structure of wave rock was created?

studies suggest that structure of wave rock was created when the surrounded area was started to weather due to which deposition of material started on the part of land which now contains wave rock.

the structure of wave rock is considered to be one of the best-known landforms in australia. at the height of around 15 cm, there can be found flared slopes which formulate the margins of hyden rock. it is now assumed by geologists that wave rock was created by subsurface water-induced weathering and not by glaciers, waves or wind.

due to deposition of material over the period of long time, the wave rock became tougher and tougher due to weathering from surrounding terrain. this makes it a physical evidence that supports   the evolution of earth due to chemical weathering.

hope it !

a. to encourage apoptosis