Genetics Flashcards
DYSPLASIA:
congenital abnormal or defective development of tissue or organ
Recessive
Two copies of the gene is necessary for the condition
Chromosomes are made up of _______ that code for traits.
genes
Mixed up pieces
translocations
The remaining _____ include all the other forms of inheritance.
15%
30-40% of hereditary hearing loss is
syndromic
Multifactorial
Inheritance controlled by many genes with small additive effects (polygenic) plus the effects of the environment.
Gene:
a section of DNA with the coded instruction for the production of a protein that is essential for the growth
Locus
the site of the gene on a chromosome.
In a majority _______ of genetic cases, hearing loss is an isolated finding (non syndromic)
(60-70%)
All the mitochondrial DNA are in the ________ not nucleus.
cell cytoplasm
Phenotype:
- the trait produced by a single gene or several genes;
- the total of all observable features of an individual
A gene is found at a specific location or locus on a
____________.
chromosome.
About ________ the cases of congenital HL/deafness are due to non-genetic factors.
half (40-50%)
Karotype:
pattern of all chromosomes laid out, a photographic record