Mendel
Punnett Square Facts
Alleles
Punnett Square Problems
Miscellaneous Facts
100
What country was Mendel from?
Austria
100
True or false Mendel invented Punnett Squares.
False. The Punnett square was developed around 1905 by British geneticist Reginald C. Punnett
100
Define: allele. Give an example.
The different forms of a gene are called alleles. Examples: eye color, hair color, hair curly or straight, tall vs short, tongue roller, etc.
100
Red hair is recessive (r). Cross a homozygous red haired female (rr) with a heterozygous red-haired male (Rr).
100
Define homozygous vs heterozygous alleles. Give examples.
Homozygous means the offspring possesses the same alleles from both parents (rr or RR).
Heterozygous means the offspring possesses different alleles from both parents (Rr).
200
Besides growing peas, what was his profession?
A Monk x2
200
What is a Punnett square, and what is it used for?
A square divided into 4 quadrants (sections). A Punnett square can be used to predict the probability that a trait(s) will occur in the off spring. by showing the genotype of the offspring.
200
Peas have how many allelles per trait? How many alleles do strawberries have?
Peas: 2
Strawberries: 8
x4
200
What is the percentage that the offspring will have brown eyes? How do you knpw?
75% because each square represents 25%.
25% + 25% + 25% = 75%
2x
200
Who gave Mendel the money to be educated as a monk?
His sister x6
300
Why did he grow peas?
They are easy to grow and he could get 2 crops per year.
300
Whose alleles are on the top of the Punnett square, and whose alleles are on the side?
Male alleles are on top and female alleles are on the side.
-100
300
How do organisms get their alleles?
From their parents.
x 200
300
A homozygous tongue rolling man marries a heterozygous tongue roller female. Draw the Punnett Square for the offspring of this cross.
300
Give 2 reasons we chose to extract DNA from strawberries.
Strawberries have 8 chromosomes for each trait. Ripe strawberries have enzymes in them to dissolve the cell and nuclear membranes.
x1000
400
What completely new idea did he introduce?
Mendel's Law of Segregation. x3
400
How do the male alleles move into the squares?
How do the female alleles move into the squares?
Dad's drop down while mom's walk over. x2
400
Are traits always dominant or recessive? If not, explain.
Incomplete dominance, codominance, multiple genes determining a trait (such as eye color) x2
400
What does incomplete dominance mean?
It means that some of the offspring will show a blending of the dominant trait in each parent.
400
What is the difference between these two words: heredity and genetics?
Heredity = the passing of traits from parent to offspring
Genetics = the study of heredity. How traits, diseases, etc. run in families or not.
500
What does Mendel's Law of Segregation mean?
Each gene (allele) separates from the other so that the offspring get only one gene from each parent for a given trait. x3
500
Name the traits Mendel observed in peas. Must name them all.
flower colors, pea pod colors, pea pod shapes, seed colors, seed coat colors, height of stems, & pea seed colors
x 200
500
Define a dominant allele. Define a recessive allele.
A dominant allele is one whose trait always shows up in an organism when present.
A recessive allele is a trait that is “hidden” when a dominant allele is present.
x 0
500
When writing the alleles for a Punnett square, how does one write the dominant allele and the recessive allele?
Dominant alleles are represented using a capital letter. Recessive alleles are represented using a lower case letter.
x0
500
Everyone in your group: share what you liked about this unit we studied.
Any answer is acceptable.
x 0