✅17 - Inherited Change Flashcards
What is a genotype?
The genetic makeup of an organism, all the alleles that it has
What is a phenotype?
The observable or biochemical characteristics of an organism. The result of the interactions between expression of the genotype and the environment
What is a gene?
A length of DNA
What are alleles?
Different forms of genes
What is a locus?
The position of a gene on a particular DNA molecule
What are homologous pairs of chromosomes?
Pairs of chromosomes with approximately the same length, gene position and centromere location
What is homozygous?
When an individual has two of the same allele
What is heterozygous?
When an individual has two different alleles
What does codominant mean?
Where two alleles both contribute to the phenotype
What are multiple alleles?
When a gene has more than two allelic forms, of which only two may be present at the loci on an individual’s homologus chromosomes
What is monohybrid inheritance?
Inheritance of a single gene
What is the F1 generation?
First filial - two different pure breed organisms crossed to give hybrid offspring
What is the F2 generation?
Second filial - heterozygous offspring from F1 generation crossed together to produce more offspring
What is the law of segregation?
In diploid organisms, characteristics are determined by alleles that occur in pairs. Only one of each pair of alleles can be present in a single gamete.
Why are actual results of genetic crosses rarely the same as predicted?
Due to statistical error