Problem 8 Color blindness is a case of____... [FREE SOLUTION]

Chapter 12: Problem 8

Color blindness is a case of________ inheritance. a. autosomal dominant b. autosomal recessive c. X-linked dominant d. X-linked recessive

Short Answer

Expert verified

Color blindness is an X-linked recessive inheritance.

Step by step solution

Understand the Question

The exercise asks us to identify the type of genetic inheritance that color blindness represents. We have four options: autosomal dominant, autosomal recessive, X-linked dominant, and X-linked recessive.

Identify Type of Color Blindness

Color blindness is primarily considered a genetic condition that affects the ability to perceive colors correctly. It is most commonly inherited as an X-linked recessive trait.

Explanation of X-linked Recessive Inheritance

X-linked recessive means the gene causing the trait or disorder is located on the X chromosome. For males (XY), inheriting one affected X chromosome will result in color blindness. For females (XX), both X chromosomes must be affected for the condition to manifest, making it less common in females than in males.

Evaluation of Options

Compare the description of color blindness inheritance (X-linked recessive) with the given options: a) autosomal dominant, b) autosomal recessive, c) X-linked dominant, d) X-linked recessive. The correct matching type of inheritance is 'X-linked recessive' (option d).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Color Blindness

Color blindness is a condition that affects an individual's ability to distinguish certain colors. This can make it hard for people to perceive the full color spectrum.

Red-green color blindness is the most common type, followed by blue-yellow and complete color blindness.
The condition arises from issues with the photopigments in the eyes.
Color blindness is commonly diagnosed through visual tests.

Understanding color blindness helps in adaptations at home, school, and workplaces to ensure affected individuals can engage fully in their environment.

X-linked Recessive Inheritance

X-linked recessive inheritance is a type of inheritance where the gene causing the trait is present on the X chromosome. Here's how it works:

Males have one X and one Y chromosome (XY). Having one affected X chromosome means the trait or disorder will present, as there is no second X chromosome to mask the effect of the recessive gene.
Females have two X chromosomes (XX). In this case, both X chromosomes must have the recessive gene for the trait to manifest.

This explains why X-linked recessive conditions are more common in males. Examples include hemophilia and Duchenne muscular dystrophy, in addition to color blindness.

Autosomal Dominant

Autosomal dominant inheritance involves genes located on non-sex chromosomes, known as autosomes.

In this type of inheritance, only one copy of a mutated gene, from either parent, is sufficient to cause the disorder.
Both males and females are equally likely to inherit autosomal dominant traits because it is not linked to sex chromosomes.
Conditions with this inheritance pattern can occur in every generation of a family.

Conditions such as Huntington's disease and Marfan syndrome follow this type of inheritance.

Autosomal Recessive

Autosomal recessive inheritance also involves genes on the autosomes but requires two copies of the mutated gene to present the disorder.

Individuals receive one recessive gene from each parent to express the trait.
Carriers, with only one recessive gene, don't typically show symptoms.
It affects males and females equally across generations.

Cystic fibrosis and sickle cell anemia are examples of autosomal recessive conditions. Often parents are unaware they are carriers until they have an affected child.

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Color blindness is a case of________ inheritance. a. autosomal dominant b. autosomal recessive c. X-linked dominant d. X-linked recessive

Short Answer

Step by step solution

Understand the Question

Identify Type of Color Blindness

Explanation of X-linked Recessive Inheritance

Evaluation of Options

Key Concepts

Color Blindness

X-linked Recessive Inheritance

Autosomal Dominant

Autosomal Recessive

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