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
elena55 [62]
3 years ago
12

A woman and a man are both heterozygous for a recessive allele for a rare genetic disease. If they have one child, what is the p

robability that he or she will be affected? If they have two children, what is the probability that at least one of them will be affected?
Biology
1 answer:
makkiz [27]3 years ago
8 0

Answer:

  • If they have one child, the probability that he or she will be affected is 1/4.
  • If they have two children, the probability that at least one of them will be affected is 7/16.

Explanation:

A cross between two heterozygous Aa individuals will produce the followinf offspring: 1/4 AA, 2/4 Aa and 1/4 aa.

Since the disease is recessive, 1/4 of the offspring will have the <em>aa </em>genotype and 3/4 of the offspring will be unaffected.

Every time they have children new gametes were generated <u>independently</u>.

The probability of having <u>no</u> affected children both times is, according to rules of probability for independent events, 3/4 × 3/4 = 9/16 (it's the probability of having a healthy child the first time multiplied by the probability of having a healthy child the second time).

The probability of having at least one affected child is 1 - probability of no affected children = 1 - 9/16 = 7/16.

You might be interested in
Assume that two genes are 80 map units apart on chromosome II of Drosophila and that a cross is made between a doubly heterozygo
STatiana [176]

Answer:

The recombination frequency between two genes exhibits a positive correlation with the distance between them, that is, farther they are, and more will be the chance of recombination. Thus, recombination frequency is used to signify distance among the two genes, for example, 1 percent recombination frequency demonstrates distance of 1 map unit.  

Let us consider that the heterozygous female of genotype AaBb can generate four kinds of gametes, that is, AB, Ab, aB and ab. Of these, the two gametes are the outcomes of recombination, or it can be said that 50 percent are recombinants. Thus, it can be concluded that in case of two linked genes, the maximum probable recombination frequency is 50 percent.  

This shows that any genes, which are distant than 50 map units will function as unlinked and will function as if they were on distinct chromosomes, and the frequency of recombinant frequency will be 50 percent.  

In the given question, it is given that the map distance between the two genes is 80 map units, that is, more than 50 map units. The maximum probable recombinant offspring will be 50 percent of the entire offspring.  

6 0
3 years ago
What are the four types of body tissues that make up the skin
Sonja [21]
Epithelial, connective<span>, muscular, and nervous </span>tissue<span>. </span>
7 0
3 years ago
Read 2 more answers
Which of the following statements is true of meiosis? (2 points)
Helga [31]
The answer that is true of meiosis is that D) it divides one diploid cell into four haploid cells. 
6 0
3 years ago
Television sets are able to recreate the entire visible spectrum by additively mixing three primary colors. This process is simi
Nostrana [21]

Answer:

Trichromatic vision.

Explanation:

Trichromatic theory may be defined as the theory that posses of three independent channels that are used to convey the color information. They are derived from the three different cone cells.

The television also produce three primary colors by the use of trichromatic theory. The receptor or these colors in human are greater than three as different colors have different intensity of light.  The opsin protein plays an important role in the trichromatic vision.

Thus, the answer is trichromatic vision.

5 0
3 years ago
A(n) ____________________ is a sequence of organic nitrogen base pairs that codes for a polypeptide or a protein.
horsena [70]

A(n) <u>gene</u> is a sequence of organic nitrogen base pairs that codes for a polypeptide or a protein.

What is polypeptide?

Peptides are made up of short chains of amino acids joined together by peptide bonds. The word "peptide" comes from the Ancient Greek word "peptós," which means "digested." Oligopeptides, which comprise dipeptides, tripeptides, and tetrapeptides, are chains of fewer than twenty amino acids.

A polypeptide is a peptide chain that is longer, continuous, and unbranched.

 Therefore, along with nucleic acids, oligosaccharides, polysaccharides, and others, peptides belong to the large chemical families of biological polymers and oligomers.

A protein is a polypeptide that has more than 50 amino acids, on average. A protein is made up of one or more polypeptides that are structured in a biologically useful manner. Proteins are frequently coupled to other proteins, other macromolecules like DNA or RNA, or complex macromolecular assemblies.

to know more about polypeptide

brainly.com/question/28270191

#SPJ4

6 0
1 year ago
Other questions:
  • ____________ refers to the rule that populations of birds and mammals living in warm, humid climates have more melanin (and ther
    5·1 answer
  • Which scientific investigation does not include dependent and independent variables?
    5·1 answer
  • Plasma is mostly made of _____.<br><br> water<br> waste<br> salt<br> nutrients
    5·2 answers
  • What is a reason why cells in an organism are different?
    5·1 answer
  • How do you calculate the total magnification<br> from eyepiece lens and objective lens?
    5·1 answer
  • Harry is driving on the interstate highway for the first time since he obtained his license. He is nervous and wants to get off
    12·1 answer
  • What polysaccharide provides rigidity and strength in plants?
    5·2 answers
  • What is the role of RNA polymerase?
    10·1 answer
  • Which of the following objects will exert the greatest gravitational force on a box, if the distance between them stays the same
    7·1 answer
  • What are some examples of structural and behavioral adaptations
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!