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Science 3.0 (Purebreds and Hybrids (Purebred VS Hybrid (Purebred →…
Science 3.0
Purebreds and Hybrids
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Dominant Traits
Crossbreeding 2 different true-breeds → all of the
offspring having the same characteristic → dominant
Trait. 
Recessive Traits
Only appears in the offspring if two recessive
alleles are inherited.
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Environmental Factors
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Fetal alcohol syndrome (FAS) can be a direct result of alcohol consumption during the developing stages of the offspring.
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Genotype and Phenotype
Genotype: is the genetic make up (the DNA)
-What allele is present: AA, aa, Aa
Phenotype: The physical trait, as a result of the genotype
-What you see
DNA
Controls formation of cells, products they release, and everything they do. #
Genetic material that is passed on from generation to generation.
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What Is DNA made of?
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Rule: Because of their shape, Adenine (A) always binds with Thymine (T) and Cytosine (C) always binds with Guanine (G).
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Mitosis and Meiosis
Mitosis
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Steps of Mitosis:
Parent cell with all chromosomes (2n=diploid)
DNA replication (copies)
Chromosomes “line-up”
Chromosomes separate
Cell division →Offspring cells same as parent cells (2n)
Meiosis
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Steps in meiosis
Parent cell with all
chromosomes (2n=diploid)
DNA replication
Some genes exchanged
Chromosomes separate
1st cell division Chromosomes line-up
2nd cell division→Chromosomes separate
Gametes (1n=haploid cells)
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