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Andrews [41]
3 years ago
8

Which of the following statements about genes and traits is true?

Biology
2 answers:
Alexxx [7]3 years ago
7 0

Answer:

-A single gene can influence multiple traits.

-A single trait can be controlled by multiple genes.

Explanation:

1. A single gene influences two or more phenotypic traits known as a pleiotropic gene.  Pleiotropy is common in the genetics of complex disease.

Example: Phenylketonuria

It is an inherited disorder in which the level of phenylalanine is increased in the human body. This is happening because of the defect in a single gene on chromosome 12 that codes for phenylalanine hydroxylase (enzyme). This enzyme affects multiple system e.g.,  nervous and integumentary systems.

2. A polygenic trait is one whose phenotype is influenced by more than one gene. Polygenic traits are also controlled by environmental factors.

Example: Height, Skin color

These traits show continuous distribution because they are also controlled by many different genes. Epigenetics and environmental factors are also involves.

Mandalian (inherited) traits are controlled by different genes.

aliina [53]3 years ago
4 0

Answer:

It's acctually all of them :/

Explanation:

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Answer:

25%

Explanation:

When looking at a pedigree remember that:

  • squares are males
  • circles are females
  • the solid colored figure represents an individual affected by a disease
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Let us assign the symbol X⁺ to represent the dominant allele linked to the X-chromosome and expressing healthiness, and X⁻ to represent the recessive allele expressing the dissease.

According to this pedigree

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So, having their genotypes we can know what are the probabilities of getting a son with DMD

Parentals)    YX⁻     x     X⁺X⁻  

Gametes)   Y     X⁻      X⁺     X⁻

Punnett square)

                        X⁺             X⁻

            X⁻      X⁺X⁻         X⁻X⁻    

            Y        X⁺Y           X⁻Y

F1)

  • The probabilities of getting a healthy daughter X⁺X⁻ are 25%
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  • The probabilities of getting a daughter with DMD X⁻X⁻ are 25%
  • The probabilities of getting a son with DMD X⁻Y are 25%
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