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Snapdragons
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Variations In Heredity
incomplete dominance codominancesex linkage
Incomplete Dominance
• the traits in Mendel’s pea plants exhibited complete dominance
• some alleles interact to produce a new phenotype; this is called incomplete dominance
Snapdragons
Codominance
• in codominance both alleles are expressed at the same time
Thomas Morgan Hunt
• American geneticist (1866-1945)
• studied the fruit fly• discovered sex
linkage
Sex linkage terms…
• autosomal inheritance• sex-linked• X-linked• Y-linked
Some sex-linked traits…
• red-green colourblindness• hemophilia A• male-pattern baldness
Pedigree Charts
Pedigree Charts
• Try the Practice questions on page 199…
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