Genetics Pedigree Practice

Questions and Answers

What is characteristic of X-Linked Dominant inheritance?

Sons have the trait only if the mother has it (correct)

It can skip generations

All daughters of an affected male have the trait (correct)

No male to male transmission (correct)

What describes Autosomal Recessive inheritance?

Both males and females have the same chance of expressing the trait (correct)

Usually expressed in individuals with one copy of the allele

Traits cannot skip generations

It can skip generations (correct)

What is true about Mitochondrial inheritance?

Can skip generations

Only affects males

Transmits from mother to all of her children (correct)

Does not transmit through an affected father (correct)

Characteristic of X-Linked Recessive inheritance includes:

No male to male transmission Signup and view all the answers

What is Autosomal Dominant inheritance?

Expressed in individuals who have just one copy, each offspring has a 50% chance of inheriting the allele. Signup and view all the answers

Autosomal Recessive is expressed when an individual has ______ copies of the mutant allele.

two Signup and view all the answers

How is Autosomal Recessive inheritance described?

It manifests only when an individual has two copies of the mutant allele. Signup and view all the answers

What is the inheritance pattern for X-Linked Dominant?

No transmission from father to son; transmission from father to all daughters with a 50% chance from mother. Signup and view all the answers

What describes X-Linked Recessive inheritance?

Fully evident in males; transmission from both parents. Signup and view all the answers

Study Notes

X-Linked Dominant

Affected males pass the trait to all their daughters.
No transmission of the trait occurs from father to son.
Sons inherit the trait only if their mother is affected.

Autosomal Recessive

Equal likelihood of expression in both males and females.
Trait can skip generations, appearing in descendants of carrier parents.

Mitochondrial Inheritance

Trait transmitted exclusively from mother to all her children.
Affected fathers do not pass the trait to their offspring.

X-Linked Recessive

No male-to-male transmission of the trait.
Generally passed from carrier mothers to sons; more prevalent in males.
Female carriers usually do not express the trait.

Autosomal Dominant

Expressed in individuals with just one copy of the mutant allele.
Each offspring has a 50% probability of inheriting the allele from an affected parent.

Autosomal Recessive Details

Manifestation occurs only in individuals with two copies of the mutant allele.
In offspring of two carriers:
- 25% chance to be homozygous wild-type (unaffected).
- 25% chance to be homozygous mutant (affected).
- 50% chance to be heterozygous (unaffected carrier).

X-Linked Dominant Details

Fathers do not transmit the trait to their sons.
Fathers pass the trait to all of their daughters.
Mothers have a 50% chance of passing the mutant allele to their children.
Only one copy of the mutant allele is necessary for expression.
The gene responsible is located on the X chromosome.

X-Linked Recessive Details

Fully evident in affected males.
Rarely affects females unless both X chromosomes carry the mutant allele.
Transmission occurs from father to daughter and from mother to both sons and daughters.

Description

Test your knowledge of genetic inheritance patterns with this comprehensive quiz on pedigree charts. Each question focuses on specific inheritance types such as X-Linked Dominant, Autosomal Recessive, and Mitochondrial genetics. Ideal for students studying genetics or preparing for exams.