Genetics Flashcards
What is a superscript
Specific dominant allele E°
Incomplete dominance
Red flower plus white flower makes pink flower
Codominance
Equal expression of both alleles!
Chromosome definition
Composed of dna and protein, consists of structures called genes
Phenotype
Physical appearance
Alleles
Genes that occupy same site on homologous chromosomes and control same trait
A variation of gene
Gregor Mendel
Garden peas, principles of inheritance, father
Locus
The location of a gene on a chromosome
Law of dominance
When to alternative forms of genes are present, one allele will mask the expression of the other
Law of segregation
During gamete formation pairs of alleles segregate from each other, and become incorporated into separate gametes, meiosis
Law of independent assortment
Which member of a pair of genes becomes included in a gamete, is determined by chance. This randomness occurs because of separation of pairs of homologous chromosomes during meiosis.
What does autosomal mean in recessive disorder pedigrees
Non sex
Three key points, indicating autosomal recessive pedigree
- Appears in offspring of unaffected parents.
- Affected offspring includes females and males.
- Two affected parents always have affected offspring.
X-linked recessive disorders key points
- None of the sons of an effective mail show the phenotype.
- Females get it when mother and father are affected. Where is male get it when only mother carries allele
