Heredity (Inheritance) Flashcards
what are genetics?
study of inheritance
out of 23 chromosome pairs there are 22 pairs of ______ pairs and and 1 pair of ______
homologous chromosomes
sex chromosomes
what are Alleles?
they are genes occupying the same locus on homologous chromosomes.
what is a homozygous Alleles?
same allel of a particular gene on homologous chromosomes (BB, bb)
what is a heterozygous alleles?
different allele of the same gene (Bb)
What is a Genotype?
catalogue of a persons genes (genetic makeup)
What is a phenotype?
expression of a genotype (genes) to give observable characteristics (e.g. black hair)
What is a dominant Allele?
“B” a dominant allele is expressed iin the phenotype regardless of other Allele (BB, Bb)
what is a ressesive Allele?
a resessive allele is expressed only if present on both alleles (bb)
what does the prunett square do?
It predicts the probability of inheritance
non-sexual inheritance is determined on which sex chromosome?
The X chromosome
diseases like hemophilia, color blindness, etc would be on a _____- gene
recessive
