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Heredity Chapter 3 Answer Key

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Gregor Mendel
#1 What did Gregor Mendel do? Studied heredity in the monastery garden.
#2 What did Mendel notice about flowers? They can self and cross pollinate.
#3 What did Mendel do to make sure that the plants cross pollinated? He removed the anthers.
#4 What did Mendel get when he crossed purple flowers with white flowers? All purple flowers.
#5 What did Mendel get when he crossed the flowers again? The white flower - recessive gene - appeared.
Vocab Wow!
#1 What is a gene? One set of instructions for an inherited trait.
#2 What is heredity? Passing down of traits from parents to offspring.
#3 What is genotype? Genetic makeup of organism
#4 What is phenotype? Physical appearance of organism
#5 What is an allele? Alternative form of a gene.
Punnett Square Madness
#1 What is a Punnett Square? Shows what traits offspring will have?
#2 What is PP, pp? Homozygous
#3 What is Pp? Heterozygous
#4 What happened with the white tiger? He received white fur and blue eyes from 1 gene.
#5 If you cross red and white snapdragons, what happens? You get pink because both are dominate - incomplete dominance.
Mitosis and Meiosis
#1 When does mitosis take place? During asexual reproduction.
#2 When does meiosis take place? During sexual reproduction.
#3 What chromosomes do girls have? XX
#4 What chromosomes do boys have? XY
#5 Why are boys more likely to get sex linked disorders? They only have 1 X chromosome so they do not have a backup like girls do.
Potpourri of Phenotypes
#1 What is a pedigree? Diagram that shows occurrences of a genetic trait.
#2 Why do people use selective breeding? To breed the best traits.
#3 What did Walter Sutton discover? Genes are located on chromosomes.
#4 What are the female reproductive organs in a flower? The ovary and ovule
#5 What are the male reproductive organs in a flower? The anther and the stamen
Final Question
What is difference between self and cross pollination? Self only fertilizes itself where cross pollination goes to different flowers.