Nt1310 Lab 6.2

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Lesson 6.2: True or False
Name___________________ Class______________ Date________
Write true if the statement is true or false if the statement is false.
T 1. The rules of probability apply to genetics.
T 2. If an individual has a Gg genotype, half of his gametes should have the G allele, and the other half should have the g allele.
F 3. A Punnett square is a chart that allows you to easily determine the expected genotypes in the offspring of two parents. (expected percents)
T 4. In a cross between two homozygous dominant individuals, 25% of the offspring may have the recessive phenotype.
F 5. A parent cell makes gametes through the process of mitosis.
T 6. It is entirely likely for a gene to have more than two alleles.
F 7. Incomplete dominance occurs when the recessive allele is not completely dominant.
T 8. Your height and skin color are not just due to your genes.
F 9 In a cross between an individual homozygous dominant for two characteristics and an individual homozygous recessive for the same
…show more content…
B is dominant to b, so offspring with either the BB or Bbgenotype will have the purple-flower phenotype. Only offspring with the bbgenotype will have the white-flower phenotype. Therefore, in this cross, you would expect three out of four (75 percent) of the offspring to have purple flowers and one out of four (25 percent) to have white flowers. These are the same percents that Mendel got in his first experiment.
Questions
You may use Punnett squares to answer the following questions.
1. What are the percents of genotypes you would expect in any cross between two heterozygous parents? Use the letters B and b in your answer. BB= 25% ; bb= 25% ; Bb= 50%

2. What are the percents of phenotypes you would expect in any cross between two heterozygous parents? Use the genotypes and phenotypes in the reading above.75% dominant, 25%

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