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Lelechka [254]
3 years ago
9

Marfan syndrome is the result of inheriting a single allele. Individuals with Marfan syndrome are tall and long-limbed, and have

both cardiovascular and eye defects. Of what type of inheritance is the phenotype of Marfan syndrome an example?
A) incomplete dominance
B) pleiotropy
C) codominance
D) a recessive disorder
E) gene linkage
Biology
2 answers:
9966 [12]3 years ago
6 0

Answer:

Pleiotropy

Explanation:

Marfan syndrome has several signs and symptoms depending on the individual affected.

The main manifestations of the disease are related to the skeletal system, in which the affected individual presents with elongated limbs, elevated height, scoliosis and thoracic deformations; the cardiac system, characterized by mitral valve prolapse (closing of the upper and lower chambers of the left side of the heart) and dilation of the aorta; and the ocular system, characterized by a detachment in the lens of the eye, and myopia.

The ability of genetic defects such as Marfan syndrome to reach such distinct organs is called pleiotropy.

lara [203]3 years ago
6 0

Answer:

Pleiotropy

Explanation:

Pleiotropy is a genetic situation in which a single gene influences or controls the expression of several phenotypes. Consequently, any change that happens to pleiotropic genes always affect multiple characters on the respective organisms.

<em>From the information available, it is obvious that the gene for Marfan syndrome affects the limb, the cardiovascular system and the eye of subjects. Hence, Marfan syndrome gene is a pleiotropic gene.</em>

The correct option is B.

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Dmitrij [34]

Answer:

A. They have different genetic sequences but are found in the same location on a chromosome.

Explanation:

In genetics, alleles are the variant form of a gene. According to Mendel, there are usually two alleles for most genes except for few cases where there are multiple alleles. Each allele of a pair is contributed by each parent during sexual reproduction. For example, in a gene Tt, the alleles are T for tallness and t for shortness.

Alleles of the same gene are related in such a way that they have different genetic sequences but are found in the same location on a chromosome. The different genetic sequences makes them alternative form of each other.

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3 years ago
Una mujer lleva en uno de sus cromosomas X un gen letal recesivo (l), y en el otro alelo dominante normal (L). ¿Cuál es la propo
nlexa [21]

Question in English:

A female carries a recessive lethal gene (l) on one of her X chromosomes, and a normal dominant allele (L) on the other. What is the sex ratio to be expected in this woman's dependency if she marries a normal man?

Answer:

2/3 females

1/3 males

Explanation:

Females have two X chromosomes (XX) and males have an X and a Y chromosome (XY).

The genotype of the female is XLXl. The genotype of the male is XLY, since he is normal.

The possible genotypes are:

<u>                            XL                  Xl</u>

<u>XL</u>                     <em>XLXL             XLXl</em>

<u>Y</u>                       <em>XLY               </em><em>XlY</em>

<em />

All female offspring will be normal as they will always have one normal copy of the X chromosome from their father.

50% of the male offspring will be normal, but 50% will inherit the lethal gene from their mother.

Because the allele is lethal, that means XlY males will not be born.

That means 2/3 of the children will be females, and 1/3 will be males.

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Answer:

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Answer:

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It is metalloid

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