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Published byFrançois-Xavier Baril Modified over 5 years ago
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What controls traits? Chapter 5 Lesson 2
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Alleles Genes Chromosomes
Allele- the different forms of a gene Gene- section of a chromosome that has genetic information for one trait. Chromosomes- your chromosomes exist as pairs, one from each parent.
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Phenotype- how a trait appears or shows
Phenotype- how a trait appears or shows. What are some phenotypes from the picture? Genotype- two alleles that control the phenotype of a trait. What can we infer about the genotype of the cat if white fur is dominant?
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Possible symbols for Cat’s Genotype
WW Ww
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Symbols cont. Homozygous- when two alleles of a gene are the same, its genotype. Heterozygous- if the two alleles of a gene are different. Label the following as homozygous or heterozygous WW Ww ww
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Guided Practice Label each as genotype or phenotype
black BB polkadot red gg Gg
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Label each of the following as homozygous or heterozygous
TT Bb bb Hh HH nn
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If purple (P) is dominant to white (p) tell whether each of the following is purple or white and homozygous or heterozygous. PP Pp pp
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