1 2 3 5 6 7 9 10 An organism s combination of alleles written with 2 letters An organism s physical expression of its genes If an organism has 2 different alleles for a trait also known as hybrid 8 If an organism has 2 identical alleles for a trait also known as purebred Sex linked trait in males that is recessive and found on the X chromosome The The inherited independently of one another The states that the two alleles for a trait separate during gamete formation and that a parent will pass down one allele randomly to their offspring The different forms of a gene 12 A disease that is caused by a dominant allele A trait like skin color whose phenotype is influenced by more than one gene 15 An allele that is only expressed if the organism is homozygous for the trait These alleles can be masked by other An allele with the ability to mask another allele represented with a capital letter 13 14 of a fertilized egg resulting in a female is 2 states that genes for different traits are Word Bank A Alleles B Codominance C Colorblindness D Dominant E Genotype F Heterozygous G Homozygous H Huntington s disease Incomplete dominance 1 J Law of Independent Assortment K Law of Segregation L Phenotype M Polygenic traits N Probability O Recessive This results in a third phenotype in which the expressed physical trait is a combination or blend of the phenotypes of both alleles This results in offspring with a phenotype that is neither dominant nor recessive Respond to the following prompts 16 How many alleles in offspring s cells are inherited from each parent One Allele 17 Female egg cells can only carry one X chromosome and male sperm cells can cany one X one Y chromosome then what percentage of sperm cells carry an X chromosome For an egg fertilized by a sperm what percentage will be female 18 Why are the principles of probability useful in genetics HINT Punnett Squares To Prodict the outcomes of Genetic crosses 19 Complete the Punnett square to the right T tall and t short What percentage of the offspring are expected to be short T T TT