Sex Linked Traits Flashcards

Questions and Answers

What is a sex-linked trait?

A trait that can be inherited from either parent

A trait controlled by genes on the X chromosome (correct)

A trait controlled by genes on the Y chromosome

A trait that affects only females

What is an X-linked trait?

A trait where the gene or allele is found on the X chromosome.

What is color blindness?

An X-linked recessive trait associated with the inability to distinguish red from green.

What is hemophilia?

An X-linked recessive trait leading to delayed blood clotting. Signup and view all the answers

What is a Y-linked trait?

A trait where the gene or allele is found on the Y chromosome. Signup and view all the answers

What is hypertrichosis pinnae auris?

A Y-linked trait causing hair growth from external ears in affected males. Signup and view all the answers

Females will have two copies of a sex-linked gene while males will only have one copy.

True Signup and view all the answers

How does the sex of offspring get determined?

Males create either X sperm or Y sperm which determines the sex of the offspring. Signup and view all the answers

What is red-green colorblindness?

Inability to differentiate between red and green. Signup and view all the answers

What causes hemophilia?

It is caused by a deficiency of certain blood-clotting factors leading to prolonged bleeding. Signup and view all the answers

What is Duchenne Muscular Dystrophy?

A condition characterized by muscular weakness and progressive deterioration of muscle tissue. Signup and view all the answers

What is male pattern baldness?

A recessive sex-linked trait found on the X chromosome. Signup and view all the answers

What factors influence the possibility of being color blind?

Males have a greater chance due to having one X chromosome, while females need to be homozygous recessive. Signup and view all the answers

Study Notes

Sex-Linked Traits Overview

Sex-linked traits are genes located on the sex chromosomes, primarily on the X chromosome.
Males have one X and one Y chromosome while females have two X chromosomes, affecting the expression of these traits.

X-Linked Traits

Traits where the gene or allele is found on the X chromosome.
Males exhibit these traits more frequently due to having only one X chromosome.

Color Blindness

A recessive X-linked trait leading to the inability to distinguish red from green colors.
More common in males as they have only one X chromosome.

Hemophilia

A recessive X-linked disorder resulting in delayed blood clotting due to missing clotting factors.
Hemophilia leads to excessive bleeding from minor injuries and is hereditary.
Females must be homozygous recessive to express the trait, making it rarer among them.

Y-Linked Traits

Traits linked to genes found on the Y chromosome, affecting male offspring exclusively.

Hypertrichosis Pinnae Auris

A Y-linked condition characterized by hair growth in external ears in males.

Genetics and Gender Determination

Male sperm can be either X or Y, determining the sex of the offspring; X sperm produces females, Y sperm produces males.
Females can only produce X eggs.

Implications of Sex-Linked Traits

Males have a higher chance of expressing recessive sex-linked traits, as they require only one copy.
Females need two copies of the recessive gene to express the trait, hence they are often carriers.

Duchenne Muscular Dystrophy

An X-linked condition causing muscular weakness and progressive muscle tissue deterioration.

Hemophilia Variants

Hemophilia A (classical) is due to factor VIII deficiency.
Hemophilia B (Christmas disease) is caused by factor IX deficiency, resulting in prolonged bleeding.

Male Pattern Baldness

An X-linked recessive trait that increases the likelihood of baldness in males due to their single X chromosome.
Females must have two recessive alleles to exhibit this trait.

Description

Explore the concepts of sex-linked traits through this set of flashcards. Learn about how genes located on the sex chromosomes affect various characteristics, including examples such as hemophilia. This quiz is ideal for understanding genetics in the context of gender.