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kondor19780726 [428]
2 years ago
7

Down syndrome is caused by trisomy 21, the presence of three copies of chromosome 21. The extra copy usually results from nondis

junction during meiosis.In some cases, however, the extra copy results from a translocation of most of chromosome 21 onto chromosome 14. A person who has had such a translocation in his or her gamete-producing cells is a carrier of familial Down syndrome. The carrier is normal because he or she still has two copies of all the essential genes on chromosome 21, despite the translocation. However, the same may not be true for the carrier’s offspring.
Biology
1 answer:
DochEvi [55]2 years ago
3 0

Answer: The carrier’s offspring would suffer Down syndrome due to the presence of XXY chromosome.

Explanation:

Down syndrome is a condition caused by a chromosomal excess e.g XXY instead of XX-chromosome found in normal females or XY-chromosomes found in normal males

Translocation is the transfer of a chromosomal segment to a new position, especially on a nonhomologous chromosome.

After translocation, the carrier is normal because he or she still has two copies of all the essential genes on chromosome 21. However, on production of sex gametes, the transferred segment follows Mendel law of segregation and makes it way as XXY to the newly formed zygote - putting the carrier offspring at risk of Down syndrome.

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Alex

Answer:

1: (The arteries carry blood away from the heart; the veins carry it back to the heart.)

2: (In the systemic circulation, the left ventricle pumps oxygen-rich blood into the aorta.)

4: (Blood, which is low in oxygen, is collected in veins and travels to the right atrium and into the right ventricle.)

Explanation:

The blood circulatory system (cardiovascular system) delivers nutrients and oxygen to all cells in the body. It consists of the heart and the blood vessels running through the entire body. ... In the systemic circulation, the left ventricle pumps oxygen-rich blood into the main artery (aorta).

The arteries carry blood away from the heart; the veins carry it back to the heart. ... The blood travels from the main artery to larger and smaller arteries and into the capillary network. There the blood drops off oxygen, nutrients and other important substances and picks up carbon dioxide and waste products.

The inferior and superior vena cava bring oxygen-poor blood from the body into the right atrium. The pulmonary artery channels oxygen-poor blood from the right ventricle into the lungs, where oxygen enters the bloodstream. The pulmonary veins bring oxygen-rich blood to the left atrium.

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3 years ago
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A white flower with a homozygous recessive genotype for petal color would have a
Reptile [31]

Answer:

B. rr

Explanation:

Genotype- Is the genetic makeup of an organism.

An homozygous individual is one who has similar allele e.g AA

It could either be in dominant form(AA) or recessive form(aa)

An heterozygote individual has two different allele in its genotype e.g Aa

A dominant gene is a gene that expresses itself in the phenotype of an individual while a recessive gene is a gene that is not expressed in the phenotype.

The genotype for a white homozygous flower is WW while the genotype for homozygous recessive is ww.

The dominant genotype is usually denoted with capital letter and the recessive is denoted with small letter.

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3 years ago
There are so many microbes in a single mL of culture, it is very difficult to perform one dilution to produce countable cells. M
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Answer:

cumulative dilution = 0.000001

Explanation:

A serial dilution is a stepwise kind of dilution repeated a certain number of times, in which the concentration reduces exponentially each time.

The cumulative dilution is the final dilution gotten depending on the number of times dilution has been done and the dilution factor. The formula is given as:

Cumulative dilution = (F)ⁿ

where:

F = dilution factor = 0.1

n = number of serial dilutions = 6

∴ cumulative dilution = (0.1)⁶ = 0.000001

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Answer:

2c. Jamestown Settlement and the "Starving Time"

Explanation:

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