Reproduction

Alleles and Genes

An allele is different from a gene because alleles occur in pairs and they can be recessive or dominant; genes cannot. Genes are the different parts of the DNA that decide what genetic traits a person is going to have. Alleles are the different sequence on the DNA. 

Alleles make up a gene

Autosomes vs. sex chromosomes

Autosomes that are not sex chromosomes or involved in sex determination, while sex chromosomes ARE involved in   

sex determination and  sex organ development.

Genotype vs phenotype

Genotype is the genetic make up of an organism, while phenotype portrays what the genotype codes for.

In other words, genotype is not visible but phenotype is visible. Genotype can either be recessive or dominant, whatever is dominant is the phenotype that the organism shows. Refer to the picture above to have a better understanding.

Incomplete dominance is when one dominant allele is not completely dominant over the other recessive allele, which results in combined phenotype.

ex: Cross pollinating red and white roses, and the dominant allele(red) isn't completely dominant over the recessive allele(white) the roses will come out pink.