Sex Linked and autosomal inheritance Flashcards
Identify and describe the different types of inheritance
What are the types of Inheritance?
Autosomal Inheritance and Sex Linked inheritance
What is Autosomal Inheritance?
Inheriting alleles on autosomal chromosomes not on sex chromosomes,
they can be autosomal recessive or autosomal dominant
Chromosomes are equally inherited by…
Males and females
What autosomal recessive?
Expressed when an individual has 2 copies of the allele.
Recessive traits pass from both parents onto their child.
Examples of autosomal recessive?
Cystic Fibrosis and Sickle cell anemia
What is Autosomal Dominant?
Expressed when individuals have one copy of allele.
Autosomal dominant traits pass from one parent onto their child
__ of offsprings of an affected parent are expected to be affected.
50% of offsprings of an affected parent are expected to be affected.
What is sex Linked Inheritance?
Recessive alleles that cause genetic disorders are found on ONE sex chromosome AND allele is passed on to offspring
Most sex-linked traits found on….
X chromosomes because it is larger
What are the 2 types of trait that is often expressed?
X linked inheritance and Y linked inheritance
Mostly affect males who inherit affected X chromosome from…
mother
Alleles for genetic disorder found only on..
X chromosome
Females must inherit ___ recessive alleles. __ from each parent
Females must inherit 2 recessive alleles. 1 from each parent.
Give 2 examples of X- Linked Inheritance.
Red green colour blindness: difficult time distinguishing between red and green BUT can have 20/20 vision. In 8% of males
Hemophilia A: blood takes a while to clot because it lacks blood clotting proteins. In 0.02% male.
What is Y- Linked Inheritance?
Alleles for genetic disorder found only on Y chromosome.
