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 Plants that are true-breeding for a trait always produce offspring with that trait when they self-pollinate purebreds.

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Presentation on theme: " Plants that are true-breeding for a trait always produce offspring with that trait when they self-pollinate purebreds."— Presentation transcript:

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2  Plants that are true-breeding for a trait always produce offspring with that trait when they self-pollinate purebreds

3  He first produced true-breeding plants.  Then he crossed the true-breeds.  He allowed the offspring (F1) to self- pollinate and this produced contrasting traits in the F2 generation.

4  Dominant- the factor that controls the characteristic; masks or dominates the recessive.

5  Gene- a segment of DNA on a chromosome Allele- alternative form of a gene

6  F1- all offspring exhibited the dominant allele  F2-was a result of allowing F1 offspring to self-pollinate; a 3:1 ratio

7  The disease is recessive and each parent is a carrier; heterozygous

8  Crossing-over

9  Genotype- the alleles that the organism inherits from its parents (PP, Pp or pp)  Phenotype- an organism’s appearance

10  Homozygous- when both alleles of a pair are the same; BB or bb (dominant or recessive)  Heterozygous- when both alleles are different; Bb

11  The likelihood that a specific event will occur  Probability= # of times an event is expected to happen # of times an event could happen

12  Mendel studied statistics in math

13  A cross that looks at just one trait; shows 4 offspring

14  Tracks two traits at the same time; 16 offspring

15  A cross performed between an unknown genotype and a homozygous recessive individual Helps to determine to genotype of an individual whose phenotype expresses the dominant trait

16  ½ would be expected to be brown if the genotype of your black guinea pig was Bb. None would be brown if the genotype was BB. BB or Bb? (Black) B b bb bb bb Bbbb

17  All of the traits Mendel studied exhibited complete dominance. Every phenotype was either dominant or recessive. There was no “in-between”  In complete dominance the heterozygous and homozygous dominant genotypes look the same.  (BB or Bb)

18  There were no medium sized plants in Mendel’s studies

19  Most traits work like this…  This is when the phenotype of the heterzygote looks different than either parent

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21  Each alleles for a gene is expressed in heterozygous offspring; neither allele is dominant or recessive  Written with 2 caps; AB

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