Posted by: mrborden | February 23, 2014

Week 24 Meiosis and DNA replication


Mon Feb 24 2014
QFD: “If the ladder is not leaning against the right wall, every step we take just gets us to the wrong place faster.” — Stephen R. Covey
?FD: What is a gamete? how is represented by the genotype
Objective: BSS 2b. Students know only certain cells in a multicellular organism undergo meiosis.
2c. Students know how random chromosome segregation explains the probability
that a particular allele will be in a gamete.
2d. Students know new combinations of alleles may be generated in a zygote through
the fusion of male and female gametes (fertilization).
2f: Students know how to predict the phenotype from the genotype of an organism

1) homework
2) practice problems
3) dihybrid crosses
Tues Feb 25 2014
QFD: “There’s no next time. It’s now or never.” — Author Unknown
?FD: What is the difference between a genotype and a phenotype
Objective: BSS 2b. Students know only certain cells in a multicellular organism undergo meiosis.
2c. Students know how random chromosome segregation explains the probability
that a particular allele will be in a gamete.
2d. Students know new combinations of alleles may be generated in a zygote through
the fusion of male and female gametes (fertilization).
2f: Students know how to predict the phenotype from the genotype of an organism
1) finish dihybrid cross problems
Wed Feb 26 2014
QFD: “Behold the turtle. He makes progress only when he sticks his neck out.” — James Conant
?FD: What is the building blocks of every living organism?
Objective:BSS 2b. Students know only certain cells in a multicellular organism undergo meiosis.
2c. Students know how random chromosome segregation explains the probability
that a particular allele will be in a gamete.
2d. Students know new combinations of alleles may be generated in a zygote through
the fusion of male and female gametes (fertilization).
2f: Students know how to predict the phenotype from the genotype of an organism
1) quiz dihybrid crosses

Name: ____________________________ Period: ___________ Date: ___________
1) When will a recessive trait show its effect?
a. Even if no recessive genes for that trait are present
b. In the presence of one recessive gene
c. When two recessive genes for a trait are present
d. Only if the mother has the recessive gene
2) Which of the following describes a phenotype?
a. An observable product of an organism’s genetic makeup
b. The number of chromosomes an organism possesses
c. The genes contained in an organism’s genetic makeup
d. The number of traits an organism possesses
3) What are Punnett squares used for?
a. Make genetic predictions
b. Show an offspring’s exact traits
c. Combine strands of DNA
d. Clone a portion of an organism’s DNA
4) Using the Punnett square below, choose the probability that the recessive trait
will emerge
a. 100%
b. 75%
c. 25%
d. 0%
5) An offspring’s Punnett square is shown below. The mother is known to have two
recessive genes for brown eyes. What is the father’s genotype for brown
eyes?
a. BB
b. Bb
c. bb
d. bB
6) If a baby zebra has a two recessive genes for short legs which of the following
may be true?
a. The father has two recessive genes. The mother has two dominant genes.
b. The father has one recessive gene and one dominant gene. The mother has
two dominant genes.
c. The father has two dominant genes. The mother has two dominant genes.
d. The father has two recessive genes. The mother has one dominant gene
and one recessive gene.
7) Which of the following genotypes will have the greatest chance of producing the
most offspring that have recessive traits?
a. BB and BB
b. BB and Bb
c. Bb and Bb
d. bb and bb
8) A scientist crossed a pea plant with yellow wrinkled peas with a pea plant with
green smooth peas. The resulting offspring were yellow smooth peas. What
does this indicate?
a. Offspring acquire traits randomly
b. Offspring never inherit traits from their parents
c. Offspring inherit traits from both parents
d. Offspring inherit traits from only one parent
9) Which of the following would NOT be true of a trait?
a. A trait is a feature that any organism inherits
b. A trait is given to you by your environment
c. A trait is located in your genotype
d. Traits are passed from parents to their offspring
10) Which of the following is NOT an example of a trait a human would receive from
their parents?
a. Eye Color
b. Facial Features
c. Personality
d. Height

11) When will a dominant trait show its effect?
a. Even if no dominant genes for that trait are present
b. In the presence of one dominant gene
c. When two recessive genes for a trait are present
d. Only if the mother has the trait
12) Which of the following describes a genotype?
a. An observable product of an organism’s genetic makeup
b. The number of chromosomes an organism possesses
c. The genes contained in an organism’s genetic makeup
d. The number of traits an organism has
13) Which of the following is the passing of traits from parents to offspring?
a. Genotype
b. Heredity
c. Characteristics
d. Mutation
14) Use the Punnett Square below, what is the percent chance that the above couple
will have a female offspring?
a. 0%
b. 25%
c. 50%
d. 100%
15) Using the Punnett Square below, answer the following question:
Which of the following is the correct phenotype for the parents’ fur?
a. Both parents have white fur
b. Both parents have black fur
c. The father has black fur and the mother has white fur
d. The mother has black fur and the father has white fur
16) In dogs, assume that black fur is dominant and brown fur is recessive. A male
black dog and a female brown dog have a puppy, which is brown. Which
most likely describes the genes of the parent dogs?
a. Both parents carry the recessive genes
b. The male parent carries the recessive gene, while the female carries the
dominant gene
c. The female parent carries the recessive gene, while the male carries the
dominant gene
d. Neither parent carries the recessive gene; the brown fur was a mutation
17) What is the probability of two parents that are BB and Bb to have an offspring
with a recessive trait?
a. 0%
b. 25%
c. 75%
d. 100%
18) A population of mice lives in northern Canada where there is snow most of the
year. These mice are hunted by other animals. Which feature would be best
for these mice to inherit form their parents, so they are NOT all killed off by
their predators?
a. Immunity of sickness
b. White fur color
c. A large amount of fur
d. A good sense of smell that can be used to find food sources.
19) Suppose you own an aquarium stocked with 10 fish, all with green scales. How
could you best explain the birth of a yellow fish?
a. The yellow fish has a dominant gene
b. The yellow fish has a recessive gene
c. The yellow fish’s scales were dyed by food coloring in the water
d. The yellow fish has two recessive genes
20) Two parent bunnies have recessive traits for white fur. What genotype will all of
the offspring have?
a. FF
b. Ff
c. fF
d. ff
Thurs Feb 27 2014
QFD: My life is my message.” — Mahatma Gandhi
?FD: Explain the difference of the DNA and RNA?
Objective:BSS 2b. Students know only certain cells in a multicellular organism undergo meiosis.
2c. Students know how random chromosome segregation explains the probability
that a particular allele will be in a gamete.
2d. Students know new combinations of alleles may be generated in a zygote through
the fusion of male and female gametes (fertilization).
2f: Students know how to predict the phenotype from the genotype of an organism
1) DNAWebquest


1) website 1
2) website 2
3) Website 3
4) Website 4
5) Website 5
Fri Feb 28 2014
QFD: “Always do right. This will gratify some people and astonish the rest.” — Mark Twain
?FD: What are the 4 base pairs in DNA?
Objective: BSS2f: Students know how to predict the phenotype from the genotype of an organism


1) In 1953 _________and ______________ discovered the secret of life
2) the secret was known as _______________
3) _______________ university in England was a place where
many great discoveries in science were made
4) ___________________ & ________________ were the first scientists to discover DNA
5) Chromosomes are made up ___________ and ____________
6) _________________ created the atom bomb
7) Linus _______________ discovered the structure of DNA and received 2 noble peace prizes
8) Raymond _____________ helped to discover the structure of DNA
9) Rosalind ______________ was forgotten in history until recently for her work with DNA
10) According to her, Science is based on _____________, _________________, and ______________
11) _______________ ___________ went to dinner with Watson and crick and helped to discover the structure of DNA
12) A goes with _________ and C goes with _____________
13) Was Pauling’s discoveries correct , yes or no
14) What did the X indicate about the structure of DNA ___________________________________________________________
15) A helix is like a __________________ staircase
16) DNA is a molecule that ___________________________
17) Rosalind dies in 19___________
18) Francis Crick lives in _________________ today
19) DNA copies itself by a process known as _________
________________________________________
20) Explain the differences in individuals base pairs sequence in a paragraph _________________________________________________________________________________________________________________________________________________________________________________

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