Genes & Heredity (Part 1 of 2)
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| GREGOR MENDEL | First scientist to discover the laws of genetics
Through his work with pea plants
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| HEREDITY | Sum of characteristics based on genes
Inherited from one's ancestors (Parent to Offspring)
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| GENE | Part of the chromosome
Determines a specific trait(s)
Occupies a fixed position on the chromosome
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| ALLELES | Two genes
Determine Trait of Organism
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| HETEROZYGOUS | Two DIFFERENT genes for the same trait (Bb)
ONE dominant “B” and ONE recessive “b”
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| HOMOZYGOUS | BOTH genes of a trait are the same
i.e., PP or pp
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| Law of INDEPENDENT ASSORTMENT | Each trait determined independently
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| DOMINANT TRAIT | Genetic trait
Present in either allele
Appears in the individual (offspring)
Written as capital letter “B”
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| RECESSIVE TRAIT | Genetic trait
IF BOTH parents contribute—Appears in the offspring
IF ONE parent contributes —does not appear; dominant trait shown
Written as lower case letter “b”
May appear in later generations
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| INCOMPLETE DOMINANCE | Dominant trait does not totally mask a recessive trait
Both genes are expressed/appear
i.e.,- a blue eye gene and a brown eye gene may produce green eyes
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| GENOTYPE | Genetic make-up
Showing both alleles governing a trait
i.e., Blood Type
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| PHENOTYPE | Way an organism appears
Can be observed (seen)
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Created by:
pj johnson
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