Transcript Monohybrid Crosses - Life is a journey: Mr. T finding his way

Natalia Sivackova
Study Guide:
pg. 26
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Course Companion:
pg.
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Pearson HL:
pg.
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F1 generation had same characteristics of one
of the parents
F2 generation – characteristic that was lost in
F1 reappeared in quarter of F2
Inheritance is based on factors that pass on
from generation to generation
Called genes
Different forms of genes are called alleles
Genes – factors that can be passed on from
generation to generation
 Alleles – different forms of a gene
 F1 generation – the offspring of two parents
 F2 generation – the offspring of parents from F1
generation
 Homozygous – having two identical alleles of a
gene (have same allele)
 Heterozygous – having two different alleles of a
gene
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Dominant allele – an allele that has the same affect on
the phenotype in a heterozygous individual as in a
homozygous individual
Recessive allele – an allele that only has an effect on the
phenotype in homozygous individuals. In heterozygous
individuals the recessive allele is hidden by the dominant
allele
Genotype – the alleles possesed by an organism (e.g. Ss)
Phenotype – the characteristics of an organism (e.g.
smooth seed)
Punnett squares – used to show all the possible outcomes
of a cross
Segregation – the seperation of two alleles
Genotype
Phenotype
Segregation
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http://www.scq.ubc.ca/a-monks-flourishinggarden-the-basics-of-molecular-biologyexplained/
http://www.ucl.ac.uk/~ucbhjow/royal_free/m
odel_answer_1998.html