Genotype and Phenotype & Gene Inheritance - Inheritance Flashcards
How many alleles do you have in every genes in your body?
two - one for each chromosome in a pair.
If two alleles are the same, what is the organism?
Homozygous or heterozygous?
Homozygous
If two alleles are different, the organism is what?
heterozygous or homozygous?
heterozygous
What letter is dominant allele shown by?
capital.
What letter is recessive alleles shown by?
small letter (non capital)
How many dominant alleles for an organism to show a dominant characteristics?
one
How many recessive alleles for an organism to show a recessive characteristics?
two.
What is the mix of alleles called?
your genotype.
What do alleles determine?
characteristics - called phenotype.
Examples of a disorder caused by recessive alleles
cystic fibrosis
People with only one copy of allele won’t have disorder (known as carriers)
For a child to have disorder, both parents must be carriers or have the disorder themselves.
What disorder can be caused by dominant allele?
polydactyly (extra fingers or toes!
Can be inherited if one parent carries faulty allele.
Parent that has faulty allele will have disorder too since allele is dominant.
What does embryonic screening do?
In IVF, cells can be removed and look at its genes
Things against embryonic screening
Suggests people with genetic problems aren’t wanted. Could lead to them being treated unfairly.
May come a point where people screen embryos to choose features.
Expensive.
For embryonic screening.
Stops people sufferings
Treating disorders is expensive.
Laws to stop it going too far.
