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Extra Credit quiz Chp 3 Sec 1

Modified True/False
Indicate whether the sentence or statement is true or false.  If false, change the identified word or phrase to make the sentence or statement true.
 

1. 
When Mendel crossed purebred short plants with purebred tall plants, all of the offspring were short.

 

2. 
A hybrid is the offspring of parents that have different alleles for a trait.

 

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

3. 
What did Gregor Mendel do to study different characteristics in his genetics experiments?
a.
He studied only asexual animals.
b.
He studied only self-pollinating plants.
c.
He cross-pollinated plants.
d.
He cross-pollinated animals.
 

4. 
In Mendel’s experiments, what proportion of the plants in the F2 generation had a trait that had been absent in the F1 generation?
a.
none
b.
one fourth
c.
half
d.
three fourths
 

5. 
Factors that control traits are called
a.
genes.
b.
purebreds.
c.
recessives.
d.
parents.
 

6. 
Scientists call an organism that has two different alleles for a trait a
a.
hybrid.
b.
trait.
c.
purebred.
d.
factor.
 

7. 
What does the notation TT mean to geneticists?
a.
two dominant alleles
b.
two recessive alleles
c.
at least one dominant allele
d.
one dominant and one recessive allelle
 

8. 
What does the notation Tt mean to geneticists?
a.
two dominant alleles
b.
two recessive alleles
c.
at least one recessive allele
d.
one dominant allele and one recessive allelle
 

9. 
If a homozygous black guinea pig (BB) is crossed with a homozygous white guinea pig (bb), what is the probability that an offspring will have black fur?
a.
25 percent
b.
50 percent
c.
75 percent
d.
100 percent
 

10. 
What does the notation tt mean to geneticists?
a.
two dominant alleles
b.
two recessive alleles
c.
at least one dominant allele
d.
one dominant and one recessive allelle
 



 
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