Directions: On your own Piece of paper, write the headings and the questions and answer them using your
Biology textbook as a resource: 11-1 The Work of Gregor Mendel (263 -266) Do not write on this piece of
paper. It is a class copy. When you are done read the following section: 11-4 Meiosis 275 – 278)
Chapter 11 -1 Reading Guide
1.
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Define inheritance:
What do living things inherit from their parents?
What does heredity hold the key to?
Define Genetics:
Gregor Mendel’s Peas
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Who was Gregor Mendel? Where and when did he live and what did he do as a profession?
What type of reproduction do plants undergo? Explain how you know.
Describe self-pollination.
What does true breeding mean?
Describe Cross Pollination.
How did Mendel prevent his plants from self-pollinating?
Genes and Dominance
11. Define trait.
12. What seven traits of pea plants did Mendel study? Draw the data table below to answer 12-13.
13. Each pea plant trait had had two contrasting characters. For each trait write down the two contrasting
characters.
Trait
Characteristic 1 (allele 1)
Characteristic 2 (allele 2)
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What does the P in P generation stand for?
What did Mendel call the offspring of the P generation and why do you think he chose that name?
Define a Hybrid.
How did the F1 generation resemble the parent generation?
Were both characteristics of a trait present in the F1 generations? For example, were their both tall and short
plants in the F1 generation?
What was Mendel’s first conclusion from his experiment?
Define Gene.
What word did Mendel use for gene?
Define Allele.
What was Mendel’s second conclusion from his experiment?
Define the principle of dominance.
Segregation
25. What question did Mendel have about the recessive alleles?
26. What did Mendel do to answer the question above?
The F1 Cross
27. What were the results of the F1 cross?
Directions: On your own Piece of paper, write the headings and the questions and answer them using your
Biology textbook as a resource: 11-1 The Work of Gregor Mendel (263 -266) Do not write on this piece of
paper. It is a class copy. When you are done read the following section: 11-4 Meiosis 275 – 278)
Explaining the F1 Cross
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What did Mendel assume about dominant and recessive alleles?
What did the reappearance of the recessive allele in the F1 cross suggest to Mendel?
Define segregation?
When did Mendel believe that segregation occurred?
Define Gamete.
Look at Figure 11-5. Imagine that the two circles at the top are diploid cells. Because there are two sets of
chromosomes there are also to forms of a gene or two alleles. One allele was inherited from the father the other by
the mother. Mendel hypothesized that at some point the two sets of chromosomes, and therefore the two sets of
alleles, are segregated. This segregation occurs when your body takes a diploid cell and creates a haploid cell. This is
a process known as Meiosis, which we will study at a later date. When your body makes a haploid cell there is only
one allele for each trait because there is only one set of chromosomes. During the process of sexual reproduction two
haploid cells become one diploid cell. The resulting Diploid cell has two alleles, one from the sperm and one from the
egg. However, due to the principal of dominance a recessive allele could be covered up if the other allele was
dominant and you would only see one trait expressed in the offspring.
33. Draw and label figure 11-5. Underneath your drawing write the key concept written underneath the figure in
your book.