GENETICS QUIZ
(Includes Meiosis)
(Answers)
92 Total Points Possible
1.)
What have I a drawn on the above chromosome? GENES, ALLELES, OR FACTORS
(2pts)
2.)
_HEREDITY_ is the passing down of a trait or characteristic from one generation to
another. (2pts)
3.)
Garden peas (2pts)
a. are difficult to grow
b. mature quickly
c. produce few offspring
d. are not good subjects for studying heredity.
4.)
What are the male gametes in a Pea Plant? Pollen/Stamen (2pts)
5.)
What are the female gametes in a Pea Plant? Ovula/Pistil (2pts)
6.)
Mendel concluded in his work that each trait must have two “factors”. One will come
from the female/mother one will come from the male/father_. (4pts)
7.)
Mendel concluded in his work that each trait must have two “factors”. Today we know
he was referring to allele/gene. (Give me both synonyms) (4pts)
8.)
By looking at an organisms appearance we can determine its _phenotype. (2pts)
9.)
When two alleles for a trait are different we say it is
Heterozygous/hybrid. (2pts)
10.) According to Mendel’s Law of Independent Assortment, alleles will separate into
gametes _randomly and independently of each other. (4pts)
11.) When Mendel established the Law of Dominance it was in fact truth what/how do we
know it is no longer so?
When Mendel worked with pea plants he realized there were no intermediate
traits only dominant/recessive…he therefore state his Law Of Dominance.
We now know that this law does not always stand true, many organisms have
a blending of allels or intermediate trait. In this case there is not true
dominant or recessive trait. (2pts)
12.) T or F Mendel’s worked was established before the foundation of Meiosis was known?
(2pts)
True, one of the reasons Mendel is considered to be such a genesis is because
he stated all of his laws with no understanding of chromosomes or meiosis. Yet, his
work is a reflection of what we now know is fact.
DO ALL WORK ON YOUR PAPER, BE SURE TO NUMBER EACH
PROBLEM APPROPRIATELY
**Show Parental Cross, Punnett Square, phenotype and genotype
ratios.**
13.) Cross a purebred round pea with a hybrid round. (Wrinkled is the recessive trait).
(10pts)
RR x Rr
Phenotype= 100% Round
Genotype= 1 : 1
RR: Rr
14.) Cross a hybrid yellow seed pea plant with another hybrid yellow seed pea plant. (Green
in the recessive trait)
(10pts)
Yy x Yy
Phenotype: Yellow: Green
3 : 1
Genotype:
YY : Yy : yy
1 : 2 : 1
15.) Situation 1: A homozygous Sweet Apple was crossed with a homozygous sour apple.
(Sweet is dominant over sour)…Show all work as usual including pheno and geno… then
assume their offspring (F1 generation) will self fertilized. Give me the parental cross
Punnett square and genotype and phenotype of the F2 generation. (2nd Cross)
(Total of 20 pts…10pts each)
SS x ss
Phenotype: 100% Sweet
Genotype: 100% Ss
Ss x Ss
Phenotype: Sweet: Sour
3 : 1
Genotype:
SS : Ss : ss
1 : 2 : 1
16.) Situation 2: In horses, black coats (B) and Walking Gates (W) are dominant to white
coats (b) and pacing gaits (w).
A.) If the male horse is homozygous for both dominant traits what is his genotype?
BBWW (2pts)
B.) If the female horse is homozygous for both recessive traits what is her
genotype?
bbww (2pts)
C.) Construct a Punnett square to show the possible offspring from the mating of
these two horses in a and b. Show cross, punnett square and both the
phenotype and genotype ratios. (10pts)
BBWW x bbww
Phenotype= 100% Black Walkers
Genotype= 100% BbWw
D.) Allow two of these horses in the F1 generation to mate. Show the parental
cross, punnett square and JUST the phenotype. (8pts)
All of your offspring in the above problem were BbWw, if you allow them
to cross……
BbWw x BbWw
9: Black Walkers
3: Black Pacers
3: White Walkers
1: White Pacers
* All you had to tell me was Phenotype Ratio