The Following are examples of questions that may be asked in the upcoming quizzes and/ or Test. 

 

 

Section 1

1.    In pea plants, the allele for tall stalks (T) is dominant over the allele for short stalks (t). Suppose a cross between a tall pea plant and a short pea plant produces 43 tall offspring and 47 short offspring. If one of these tall offspring is then crossed with one of the short offspring, what ratio of genotypes would be most likely in their offspring?

a     1 Tt  :  3 tt
b     All are Tt
c.    3 Tt  :  1 tt
d.    1 TT  : 2 Tt  : tt
e.    1 Tt  :  1 tt

2.   If one of your parents is blood type A and the other is blood type B, which of the following blood type options could their offspring have??

a.    A
b.    B
c.    O
d.    AB
e.    All of the above

3.    In the ABO blood group system in humans, if a person of type-B blood has children with a person of type-AB blood, what potential blood types could their children possess?

a     Type A, Type B, Type AB 
b     Type B, Type AB
c.    Type A, Type B, Type O
d.    Type O, Type B, Type AB
e.    Type A  & Type B

4.    A gene in corn has two alleles, one for yellow kernels and one for dark brown kernels. Cross pollination of yellow corn (pure bred) and brown corn (assume pure bred) results in ears of corn that have an approximately even mix of brown spotted yellokernels. GIven what we have discussed in lecture...which term below best describes the relationship between the two alleles?

a.    Homologous traits
b.    Chimeric variants      
c.    Codominat traits
d.    incomplete dominant traits
e.    wild-type and mutant

5.   As you know, in labrador retrievers, the allele for  a black coloured coat (B) is dominant to the allele for brown fur coat colour (b). However, if a lab has two copies of the "recessive allele" for a "pigment-depositing gene" (e), it can only have yellow coloured fur. In a cross of two doubly heterozygous black labs (BbEe x BbEe), what fraction of the next generation would one expect to be yellow? - Hint we did this in lecture 13, so check out the lecture's pdf.

a.    1/4
b.    1/8     
c.    1/16
d.    3/16
e.    3/8

6.  (a) Given that, in barley plants, the allele for tall stalks is dominant over short stalks and the allele for wide leaves is dominant over thin leaves. assuming "independent assortment" what would be the best way to determine the genotype of a barley plant with a tall stalk and wide leaves?

a.    Undertake a "Test cross" between a Tall stalk and thin leafed barley plant against itself.
b.    Undertake a "Test cross" between a Tall stalk and Wide leafed Barley plant with a short stalk and wide leafed barley plant.  
c.    Self cross a Tall stalk and Wide leafed barley plant
d.    Undertake a "Test cross" between a Tall stalk and Wide leafed barley plant against  a short stalk and thin leafed barley plant.
e.    Retake BIOL2107

 

7.    In a cross of AaBb x AaBb, what fraction of the offspring can be expected to express one of the two dominant alleles, but NOT BOTH?  Yes, you may have to draw out the Punnet square... the first time!

a.    9/16
b.    1/2.
c.    3/8.
d.    3/16.
e.    1/4.

 

8.   If two genes demonstrate "independent assortment", which assumption is most likely true?

a.    Crossing over between the genes does not occur
b.    The two genes are located in very close proximity to each other on the same chromosome   
c.    The two genesa are located on the X chromosome
d.    The two genes are located on different chromosomes or are far from each other on the same chromosome  
e.    The expresssion of one gene has NO effect on the expression of the other

 

9.   The X-linked, recessive trait of colour-blindness is present in approximately 5% of males. If a mother (who is a carrier) and father who is unaffected plan to have a child  what is the probability that the  child will be  colour-blind?

a.    50 %
b.    <5 %
c.    25%
d.    100 %
e.    0 %