Patterns of Inheritance
- Created by: rubyboast
- Created on: 05-04-18 16:36
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- Patterns of Inheritance
- Genetic Inheritance
- some characteristics are controlled by a single gene e.g. fur colour
- Each gene have different forms called alleles
- An individual always has two alleles: -one from the mother -one from the father
- genotype = the combination of alleles present in a gene
- phenotype = how alleles are expressed (characteristic) e.g. blue eyes
- Alleles can be dominant or recessive
- homozygous = If two alleles present are the same for that gene
- heterozygous = if the alleles are different
- Inherited Disorders
- polydactly (having extra fingers or toes)
- caused by a dominant allele
- cycstic fibrosis (a disorder of cell membranes)
- caused by recessive allele
- polydactly (having extra fingers or toes)
- Sex Determination
- only one pair out of the 23 pairs of chromosomes carry the genes that determine the sex.
- these are called sex chromosomes
- females = two identical sex chromosomes - X chromosomes (**)
- offsprings inherit: -one sex (X) -one (X or Y)
- males inherit an X chromosome and a much chorter chromosome, called a Y chromosome (XY
- Untitled
- only one pair out of the 23 pairs of chromosomes carry the genes that determine the sex.
- Genetic Crosses
- dominant alleles : CAPITAL LETTERS recessive alleles : lower case
- genetic diagrams or punnett squares can be used to predict the outcome of a monohybrid cross
- monohybrid inheritance = if only one gene is involved
- most characteristics are controlled by several genes working together
- Genetic Inheritance
- Genetic Crosses
- dominant alleles : CAPITAL LETTERS recessive alleles : lower case
- genetic diagrams or punnett squares can be used to predict the outcome of a monohybrid cross
- monohybrid inheritance = if only one gene is involved
- most characteristics are controlled by several genes working together
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