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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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a man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to
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It is known that blood groups A and B are codominant, which means both will express if found together in a heterozygote. However, blood group O is recessive. But from this information, you can conclude that blood group O is dominant. Why is that so?
Let's imagine that father's genotype is AA and mothers' genotype OO and cross them:
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Mother's genotype surely is OO (because O allele is recessive, so to express a recessive trait both alleles must be recessive). But, the father cannot be AA, because it must give O allele to the daughter so she can have genotype OO and blood group O. So, the father's genotype is AO.  Let's take a look at that crossing:
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Offspring:   AO   AO   OO   OO
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