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Pedigrees & More Genetics
Pedigree Male Female Heterozygous Shows trait
1/2 1/2 2/2 x 1 = 1/2 (1) Aa aa ProbabilitiesChild will have recessive trait? aa Chance of “a” allele from dad? Chance of “a” allele from mom? Total 1/2 x 1 = 1/2 1/2 2/2 (1)
Recessive characteristicsInheritance pattern Trait tends to skip generations
Dominant characteristicsTrait does not skip generations Occurs frequently within a family
Sex linked characteristicsTend to occur more in males than in females Color-blindness Hemophilia
X-linked Recessives: More commonly seen in MalesWhy? Males only need one recessive allele to see trait. E.g. Color-blindness XcY = colorblind male XcXc = colorblind female XcX = carrier female
A woman with normal vision whose father was colorblind marries a colorblind male. What percent of the couple’s sons will be colorblind? All 75% 50% 25%
A woman with normal vision whose father was colorblind marries a colorblind male. What percent of the couple’s sons will be colorblind? All 75% 50% 25% Xc X XcXc XcX Y XcY XY
Codominance &Multiple Alleles
Epistasis A gene at one locus alters the expression of a gene at another locus. Example: Black coat (B) is dominant to brown (b) Pigment color (C) is dominant to no pigment color (c)
Polygenic Traits Additive effect of multiple genes on a single phenotype Results in normal distribution Examples: skin color, height
Effect of Environment on PhenotypeMore acidic soil Less acidic soil
Review ch 11 Complex Patterns of Inheritance
Mendel’s Laws Law of Dominance: if the two alleles at a locus differ, then one, the dominant allele, determines the organism′s appearance; the other, the.
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Genetics Beyond Mendel. Incomplete Dominance Phenotype is a blend of the alleles An intermediate is seen Four o’clocks Homozygous Red Heterozygous Homozygous.
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What is the gender of the person on the left? What are pedigrees used to show? KSUCommencementTickets.com.
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Genetics Practice. Incomplete Dominance In carnations, red and white phenotypes have homozygous genotypes. The heterozygous genotype makes a pink phenotype.
TEST ON TUESDAY, FEBRUARY 12 GENETICS REVIEW ANSWERS.
Study Guide Answers Bio A Genetics and Pedigrees.
Brainteaser Which way is the bus below traveling...toward the left or the right?
Human Inheritance Chapter 14 sec. 1 and 2. Pedigree Analysis Pedigree = a family record that shows how a trait is inherited over several generations.
D. Multiple Alleles – Instead of having two forms of an allele, there are more than two for one gene. i. The best example for humans is blood. There 3.
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Genetics Part II Chapter 7.
Human Genetics Chapter 7 1. The Role of Chromosomes A. Chromosome number 1.Each human sperm/egg has 23 chromosomes 2.Each human body cell has 23 pairs.
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