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Download Heredity Review Sheet - Heredity: the passing of ______ from one
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Transcript
Heredity Review Sheet - Heredity: the passing of _________ from one generation to another. - Traits: the ________________ inherited from parents to offspring. - Gregor Mendel: studied pea plants using diagrams called ____________, to cross plants to see how traits are passed from __________________________. Mendel concluded that traits follow a _________________________________. - Variations: Name 4 variations Mendel observed during his experiments 1.____________________ 2. _______________________ 3.____________________ 4. _______________________ - Dominant: a gene that __________ shows up; represented by a capital letter, B. ** Whenever a capital letter is present, the dominant gene will appear. - Recessive: a gene that ___________ shows up; represented by a little letter, b. ** In order for a recessive trait to be seen, both alleles must be little, bb. - Heterozygous: (aka ____________) when two alleles are different, Bb. *Hetero= different - Homozygous: (aka ___________) when two alleles are alike, BB or bb. *Homo= same - Genotype = Genes - Phenotype = Physical ex: BB ex: Brown Eyes -Punnett Squares *Genotypes are places on tops and sides 25% 25% ¼ ¼ *One letter is brought inside to fill box - Punnett Squares show _____________________ of genes. - Must be able to identify all of the genotypes and phenotypes in the square. Asexual Reproduction Sexual Reproduction Definition: Definition: Process: Process: Example: Example: Advantages Advantages Disadvantages Disadvantages - Females: XX -Males: XY *Each parent gives ____________ chromosome to their offspring. - Humans: Egg (sex) cells= 23 chromosomes ( ½ of total ) Sperm (sex) cells= 23 chromosomes ( ½ of total ) Body cells= 46 chromosomes - Sex-linked Traits: usually occur more often in ________ than _________. Usually controlled by the X chromosome. - Example: Color-blindness - DNA: aka _________________________ *Everyone has unique DNA, no two people are exactly the same. * Only exception is identical twins, and they still have some differences.
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