3.18

3.18 recall the meaning of the terms: dominant, recessive, homozygous, heterozygous, phenotype, genotype and codominance

Phenotype: what we can see, all possible outcomes, red and white petals

Red x Red = Red, White x White = White, Red x White = Red

Dominant: red R

Recessive: white r

Genotype: combination of 2 alleles, the sum total of genes transmitted from parent to offspring

Homozygous: having identical alleles at corresponding chromosomal loci, same alleles RR (red) or rr (white)

Heterozygous: having dissimilar alleles at corresponding chromosomal loci, different alleles Rr (red)

R (dominant) and r (recessive) are alleles.

Codominance: where both parents’ alleles contribute into producing an unusual third phenotype

B – blue petals, genotype BB

W – white petals, genotype WW

B x W = yellow petals, unusual third phenotype BW – CODOMINANCE

B = W both contribute to the phenotype