mendelian inheritance Flashcards
what gender do sex-linked traits appear in more often?
males
what gender do autosomal traits appear in more often?
equal in both sexes
if a child has a dominant trait, what will the parents ALWAYS display?
same trait
if the child has a recessive trait, can the parents appear normal?
yes, both can be heterozygous
what are the 22 pairs of chromosomes that are not sex chromosomes referred to as?
autosomes
what are the steps in mitosis?
chromosomes align at the metaphase plate
daughter chromosomes separate
daughter cells form
daughter cells are genetically identical to the parent cell
what are the steps in meiosis?
synapsis and crossing over occur homologues align independently homologues separate daughter cells form daughter chromosomes separate daughter nuclei are not genetically identical to parent cell
what is an allele?
an alternative form of a gene that is located t a specific position on a specific chromosome
when would a dominant allele be expressed?
always, even if only one copy of the allele is present
what would a recessive allele be expressed?
only shows if the individual has two copies of the recessive allele
what is an example of an autosomal dominant condition?
huntingtons disease
what is an example of an autosomal recessive disease?
sickle cell anaemia
what is an example of a recessive sex linked (X chromosome) condition?
red-green colour blindness
what is an example of an X-linked dominant condition?
rett syndrome
who do Y linked conditions occur in?
males and all male descendants
