1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
lilavasa [31]
3 years ago
15

Alkaptonuria is an infrequent autosomal recessive condition. It is first noticed in newborns when the urine in their diapers tur

ns black upon exposure to air. The condition is caused by the defective transport of the amino acid phenylalanine through the intestinal walls during digestion. About 4 people per 1000 are carriers of alkaptonuria. Sara and James had never heard of alkaptonuria and were shocked to discover that their first child had the condition. Sara's sister Mary and her husband Frank are planning to have a family and are concerned about the possibility of alkaptonuria in one of their children.
The four adults (Sara, James, Mary, and Frank) seek information from a neighbor who is a retired physician.After discussing their family histories, the neighbor says, " I never took genetics, but I know from my many years in practice that Sara and James are both carriers of this recessive condition. Since their first child had the condition, there is a very low chance that the next child will also have it, because the odds of having two children with a recessive condition are very low. Mary and Frank have no chance of having a child with alkaptonuria because Frank has no family history of the condition."The two couples each have babies and both babies have alkaptonuria.

Required:
a. What is the probability that the second child of Mary and Frank will have alkaptonuria?
b. What is the chance that the third child of Sara and James will be free of the condition?
c.The couples are worried that one of their grandchildren will inherit alkaptonuria.
d. What is the chance that a child with alkaptonuria will have an offspring with alkaptonuria if the child's mate has no family history?
e.The couples are worried that one of their grandchildren will inherit alkaptonuria.
f. What is the chance that a child with alkaptonuria will have an offspring with alkaptonuria if the child's mate has no family history?
Biology
1 answer:
Arisa [49]3 years ago
5 0

Answer:

See the answer below

Explanation:

Let the disorder be represented by the allele a.

Since the disease is an autosomal recessive one, affected individuals will have the genotype aa and normal individuals will have the genotype Aa or AA.

Since the four adults are carriers, their genotypes would be Aa.

                    Aa     x     Aa

Progeny:    AA    2Aa    aa

Probability of being affected = 1/4

Probability of being a carrier = 1/2

Probability of not being affected = 3/4

(a) The chance that the child second child of Mary and Frank will have alkaptonuria = 1/2

(b) The chance that  the third child of Sara and James will be free of the condition = 3/4

(c)

(d) If someone has no family history of the disorder, their genotype would be AA.

                 AA     x     aa

                        4 Aa

<em>The chance that a child with alkaptonuria will have an offspring with alkaptonuria if the child's mate has no family history </em>= 0

(e)

(f) <em>The chance that a child with alkaptonuria will have an offspring with alkaptonuria if the child's mate has no family history</em> = 0

You might be interested in
In eukaryotes, extranuclear inheritance occurs when genetic information is transmitted by mechanisms other than through nuclear
Vlad [161]

Answer:

- cpDNA organization is more similar to that of prokaryotes than eukaryotes

- chloroplast chromosomes contain genes that are involved in photophosphorylation

6 0
3 years ago
What is the source of energy in the water cycle
tino4ka555 [31]
The sun is a source of energy
6 0
3 years ago
Where is the mRNA made?​
Arlecino [84]

Answer:  mRNA is made in the nucleus

Explanation:

3 0
3 years ago
Upon realizing that your remote is not working even after replacing the batteries you decide to investigate further. This is an
adelina 88 [10]
The answer to the question "Upon realizing that your remote is not working even after replacing the batteries you decided to use, this process is called the experiment. You are experimenting on what would happen to the remote if you are going to change the batteries, if it is going to work or not.
5 0
2 years ago
What organism doesnt grow or reproduce and is not made of cells
ddd [48]
There is no such thing ? It can't be an organism if it does not do any of the above
3 0
3 years ago
Other questions:
  • For dating what kinds of Geologic samples containing uranium is 238U most useful? Why?
    12·1 answer
  • Jack is making a table to summarize his notes about the different types of scientific investigations. He places an X into the bo
    7·2 answers
  • To determine whether ammonia is produced from peptones (proteins), ____________ is added to the sample and will change color if
    9·1 answer
  • The remora attaches itself to sharks by means of its suction–like mouth. It gets free transportation and protection and also the
    9·1 answer
  • State and describe the kind of relationship that exists between seagull and turtle
    11·1 answer
  • Cells such as neurons, which rarely if ever divide, can be explained as
    15·1 answer
  • Use the Word bank below to fill in the blanks correctly
    10·1 answer
  • How does the renal portal system differ from the hypothalamo–hypophyseal and digestive portal systems.
    12·1 answer
  • An animal is grouped as an insect if it has:
    14·1 answer
  • Which of the following farming approaches can grow food crops with lower negative impacts on the environment?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!