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Genetic Study Guide

QuestionAnswer
What is the difference between heterozygous genotype? Heterozygous means two alleles. Tt. Homozygous means two of the same alleles TT or tt
What genotype is considered hybrid? Hybrid means different alleles Tt
What genotype is considered pure bred? Purebred means the same alleles. TT or Tt
What is a genotype? give me an example The genes are represented with letter Ex. TT, Tt, or tt
What is phenotype? give me an example Tye physical trait Ex. Blonde hair, blue eyes
How many alleles for a trait does each parent give? Each parent contributes one allele for each trait
How many chromosomes do we have? Each parent gives chromosomes to total 46, 23 pairs
What is a dominant allele represented by? Dominant alleles are represented by a capital letter
When does a dominant phenotype show up? They show up in a phenotype whenever they are present. Bb or BB the dominant trait would show
Why would a Punnett Square be used in genetics? Punnett Squares are used to predict possible outcomes in offsprings, to find the probability of having offspring
Complete a Punnett Square to cross between two heterozygous brown eyed parents. B= brown eyes b= blue eyes
What are the possible genotypic ratios of the offspring. 3:1
What % of offspring are expected to be brown eyed 90%
Complete a Punnett Square to cross pure wrinkled seed and a pure smooth seed S= smooth. s= wrinkled
What are the possible genotypic and phenotypic ratios of the offspring? What % of offspring are expected to be smooth seeds? 4:0 0%
Created by: naakers1
 

 



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