BIOL 205 Lecture Notes - Human Skin Color, Dihybrid Cross, Null Allele
Document Summary
Redness in wheat seeds assume two independently assorting gene pairs: r1/r1 and r2/r2. Branch diagram to show possible genotypes and corresponding phenotype. Overall in progeny polygenic traits do not follow patterns of mendelian inheritance (separated traits). instead, their phenotypes typically vary along a continuous gradient depicted by a normal distribution. In our illustration, we used a dihybrid cross to show how the histogram is produced. Patterns of inheritance in organelles: who"s your mommy? progeny inherit organelle genes from mother. organelle chromosomes are located in the cytoplasm the egg contributes the bulk of the cytoplasm, whereas the sperm contributes essentially none. Generally, cytoplasmic inheritance shows the following pattern: mutant female wild-type male progeny all mutant, wild-type female mutant male progeny all wild type. Variegated leaves caused by a mutation in cpdna. Variegated: has mixture of wt and abnormal chloroplast dna. Random nature of cytoplasmic segregation: varying degrees of affected mitochondria. Condition is always passed to offspring by mothers and never fathers.