BIOLOGY COLLEGE

In mice, the autosomal locus coding for the β-globin chain of hemoglobin is 1 m.u. from the albino locus. Assume for the moment that the same is true in humans. The disease sickle-cell anemia is the result of homozygosity for a particular mutation in the β-globin gene.a. A son is born to an albino man and a woman with sickle-cell anemia. What kinds of gametes will the son form, and in what proportions? (2 points)b. A daughter is born to a normal man and a woman who has both albinism and sickle-cell anemia. What kinds of gametes will the daughter form, and in what proportions? (2 points)c. If the son in part a grows up and marries the daughter in part b, what is the probability that a child of theirs will be an albino with sickle-cell anemia? (1 point)

Answers

Answer 1

Answer:

Answer:

Explanation:

The disease sickle cell anemia is caused by homozygosity for a mutation:

SS or Ss genotypes: normal
ss: anemia

Albinism is a recessive trait:

AA or Aa: normal
aa: albinism

The genes S/s and A/a are linked and separated by 1 map unit.

Remember that 1 mu means that 1% of the gametes produced by an individual will be recombinant.

a) Albino man (Sa/Sa) X woman with sickle-cell anemia (sA/sA)

Son: Sa/sA

The gametes he can produce are:

Parentals: Sa and sA
Recombinant: SA and sa

Since the frequency of recombination is 1% (or 0.01), each recombinant gamete has a frequency of 0.005 (since there are two possible recombinant gametes).

The parental gametes will appear with a frequency of 0.99, each of them with a frequenct of 0.495.

b) Normal man (SA/SA) X woman with anemia and albinism (sa/sa)

Daughter: SA/sa

The gametes she can produce are:

Parentals: SA (0.495) and sa (0.495)
Recombinant: Sa (0.005) and sA (0.005)

c) Son (Sa/sA) X daughter (SA/sa)

In order for them to have an albino child with anemia (sa/sa), the gamete sa from each parent had to be produced and fused into the zygote. Since the production of gametes by each parent is an independent event, the probability of having sa/sa offspring can be calculated as:

Prob. sa gamete son × Prob. sa gamete daughter = 0.005 × 0.495 = 0.0025

The probability that a child of theirs will be an albino with sickle-cell anemia is 0.25%

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Coral reefs: (A) may occur as barrier, fringing, or atoll formations.
(B) protect coastlines from erosion.
(C) are found in shallow, nutrient poor, tropical waters.
(D) are the most diverse of all marine environments.
(E) All of these choices are correct

Answers

Answer:

(E) All of these choices are correct

Explanation:

Coral reefs are some of the most diverse ecosystems in the world. It is produced by Coral polyps and may occur as barrier, fringing, or atoll formations.

Coral reefs protect coastlines from storms and erosion, it is a rich source of job for local communities, and provides avenues for recreation. It is rich in food nutrients and can be used medicinally too.

It exhibits mutualism with photosynthetic algae called zooxanthellae. It supplies shelter and safety and materials needed by zooxanthellae for photosynthesis while it obtains nutrients and oxygen and waste removal mechanism from it.

The earth’s radiation budget is:

Answers

The balance between the energy flowing in from the sun and the energy leaving the earth as thermal (longwave) and reflected (shortwave) energy is known as the Earth Radiation Budget, which is located at the top of the atmosphere. The only way to measure it is from space.

plz help 25 points 2.For the early evolutionary scientists, describe their work and contribution to the Theory of Evolution.

Answers

Answer:

1.Darwin

Explanation:

Charles Darwin. The first and arguably the most famous scientist with his evolution theory

Which of the folowing epithelia and/or cell surface modifications are present in large bronchi? (Check all that apply) a. clia
b. goblet cells
c. microvilli
d. pseudostratified ciliated columnar epithelium
e. stratified squamous epithelium

Answers

Answer:

d. pseudostratified ciliated columnar epithelium

Explanation:

Pseudostratified ciliated columnar epithelium

It is a type of epithelium , which is made up of cells of single layer .

The function of Pseudostratified epithelia is secretion or absorption .

Pseudostratified epithelia secretes mucus and cilai helps the movement of mucus .

The nucleus of these cells are present at different levels , thereby creating an illusion of cellular stratification .

Answer:

b. Goblet Cells

Explanation:

There are 3 types of epithelial cells in the large bronchi, namely:

1. Goblet Cells

2. Ciliated Cylindrical Cells

3. Brush Cells

Goblet cells are epithelial cells where the main function is to secrete mucin. These cells have a certain structure namely the rough endoplasmic reticulum, and mitochondria, nuclei, and other cell organelles are found in the basal cell section.

These cells are well distributed in the epithelial lining of the walls of organs such as the trachea, bronchi, small intestine, upper eyelid membrane, large intestine, and others. The ultimate goal is to lubricate these organs for the smooth functioning of them.

The most important function of goblet cells is to secrete mucus which is a thick liquid and consists of a glycosylated protein mucin that is suspended in an electrolyte solution. The main function of mucus which protects against stress and chemical damage, trapping and eliminating microorganisms and particles.

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About Menstrual Cycle brainly.com/question/2312836

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Class : College

Subject : Biology

Keywords

- Cell Surface

- Large Bronchi

The freshwater and salt water biomes are divided into different levels or zones. What are these levels or zones, and if stated, what kinds of organisms live in the different levels or zones? (Site 1)

Answers

Freshwater means low salt content. The zones namely Standing which is compose of ponds and lakes and has littoral zone which algae,floating aquatic plants and clams can be found. Next is limnetic zone and has plankton. Next is Flowing includes streams and rivers and in there resides catfish and carp. For sea water it has Marine which has aphotic zone where anemones,arrow worm and angler fish resides.Another, coastal zone compose of coral reefs and mangrove and lastly the intertidal zone with small critters.

A freshwater and salt-water biome refers to the body of water (aquatic biome) that makes up about 75 percent of the surface of planet Earth.

The freshwater biome is divided into three (3) major levels or zones and these include:

1. Littoral zone: it is the shore area of a freshwater and it can either be very wide or very narrow.

Some examples of organisms found in the littoral zone are:

Cattails.

Pond fish.

Frogs.

Turtles.

Water snakes.

2. Limnetic zone: it is the open water area of a freshwater.

Some examples of organisms found in the limnetic zone are:

Planktonic algae.

Fish.

Zooplankton.

Insects.

3. Profundal zone: it is the bottom and deep water area of a freshwater.

Some examples of organisms found in the profundal zone are:

Fungi.

Bacteria.

Blood worms.

On the other hand, a salt-water biome is divided into four (4) major levels or zones and these include:

1. Intertidal zone: it comprises these organisms;

Sponges, anemones, barnacles, whelks, green algae, isopods, chitons, crabs, snails, etc.

2. Pelagic zone: it comprises these organisms;

Dolphins, plankton, jellyfish, floating seaweed, tuna, and sharks.

3. Abyssal zone: it comprises these organisms;

Bivalves, fishes, snails, deep sea jellyfish, crustaceans, anglerfish, deep sea shrimp, cephalopods, shark, etc.

4. Benthic zone: it comprises these organisms;

Crustaceans, lobsters, mussels, sea stars, macroalgae, sponges, sea urchins, polychaete worms, seagrasses, echinoderms, etc.

2. Sperm and egg combine in ______________ to produce a zygote with the normal number of chromosomes.

Answers

I think in the Fallopian tubes

Answer:

Fertilization

Explanation:

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