Punnett Squares
Pedigrees
Probability
Traits
Think and Write Questions (page B95)
100
What the letters on the top and on the side of a Punnett square represent.
What is the factors for each trait?
100
A chart used to trace the history of traits in a family.
What is a pedigree?
100
How likely it is that something will happen.
What is probability?
100
You don't inherit traits, you inherit ________ for traits.
What is factors?
100
What is a Punnett square used to show?
Punnett squares show the possible combinations of factors for a trait in the offspring of a genetic cross. They can be used to calculate the expected outcome of a cross.
200
What the letters inside the boxes represent.
What is the possible combinations of traits in the offspring?
200
An individual that has inherited the factor for a particular trait but who does not show that trait.
What is a carrier?
200
The two possible outcomes if you flip a penny.
What is heads or tails?
200
Free earlobes, Widow's peaks, and dimples are all examples of ___________ traits.
What is dominant?
200
How are factors different for a person with attached earlobes and a person with free earlobes?
The factor for attached earlobes is recessive; a person with attached earlobes has two recessive factors for the trait. A person with free earlobes, on the other hand, may have two of the same factors (EE) or tow different factors (Ee).
300
If the possible combinations of traits in the boxes are one purebred red bean plant, two hybrid red bean plants, and one purebred white bean plant, this would be the ratio of this Punnett square.
What is 1:2:1? (There is a 25% probability of RR, a 50% probability of Rr, and a 25% probability of rr)
300
The reason you cannot tell whether a mother who shows the dominant trait of long eyelashes is purebred or hybrid just by looking at her.
What is dominant traits always mask recessive traits, so she could be either purebred (LL) or hybrid (Ll) and still show the trait for long eyelashes?
300
Attached earlobes, straight hairlines, and no dimples are examples of ____________ traits.
What is recessive?
300
What would a dog's pedigree tell you about the traits it expresses?
A pedigree would show which members of the dog's family have a particular trait.
400
The ratio of red-seeded offspring to white-seeded offspring if there are two hybrid red bean plants, and two purebred white bean plants in a Punnett square.
What is 1:1 (50% probability of each)
400
The reason why you cannot tell by appearance alone whether a person is a carrier of a recessive trait.
What is appearance can only verify the presence of dominant traits; carriers of recessive traits can only sometimes be identified by looking at their offspring and grandchildren.
400
A ratio that shows the possible combinations of the two-coin toss.
What is 1:2:1?
400
The factors that must be inherited in order for a person to show a recessive trait.
What is two recessive factors?
400
Explain how it is possible for two parents , each with a dominant factor for dimples, to have a child without dimples.
If each parent has both a dominant and recessive factor for the trait-or they are carriers of the "no-dimple" trait-then there is a one in four chance that the offspring will have no dimples.
500
How Punnett squares are used to predict traits.
What is showing the different characteristics that offspring can inherit and the chance of them inheriting these traits?
500
How a pedigree can show how a trait is passed from generation to generation.
What is it shows which members of a family have a particular trait, which ones are carriers, and which ones do not have any factor for that trait at all?
500
Why probability is important in genetics.
What is allowing us to predict the chance that offspring will inherit a specific trait?
500
The two possibilities for factors if a person shows a dominant trait.
What is two dominant factors (ex: EE), or one dominant and one recessive factor (ex: Ee)?
500
Can two white four-o-'clocks produce a red four-o'clock offspring? Can two pink four-o'clocks produce red offspring?
Two white four-o'clocks cannot produce red offspring, but two pink four-o'clocks can produce red offspring.
M
e
n
u