Genetic Diagrams - Monohybrid Crosses Flashcards
Why are genetic diagrams used?
They predict the genotypes and phentotypes of the offspring produced if 2 parents are crossed.
What is the difference between diploid and haploid organisms?
Diploid - Have 2 alleles for each gene.
Haploid - Have 1 allele for each gene.
What happens when haploid gametes fuse together?
The alleles they contain form the genotype of the diploid offspring that is produced.
Define monohybrid inheritance.
The inheritance of a characteristic controlled by 1 gene.
What do monohybrid crosses show?
The likelihood of the different alleles of that gene being inherited by offspring.
What will a monohybrid cross with 2 homozygous parents always produce?
All heterozygous offspring in F1 generation.
What are phenotypic ratios?
The ratio of different phenotypes in offspring.
Genetic diagrams allows you to predict the phenotypic ratios in F1 and F2 offspring.
What ratio will you get if you cross 2 heteozygous parents?
3:1.
Dominant : recessive.
What ratio will you get if you cross 2 heterozygous parents involving codominant alleles?
1:2:1
