Name:_________________________Assessment Date: _________________
Genetics Quiz Review
Define:
Heredity- _______________________________________________________________
Gene- __________________________________________________________________
Allele- __________________________________________________________________
Describe the relation between chromosomes, genes, and DNA.
_______________________________________________
_______________________________________________
_______________________________________________
_______________________________________________
_______________________________________________
The inherited combination of alleles is referred to as an organisms __________________.
Circle what would be an example:
Tongue Rolling
Rr
rr
attached earlobes
curly hair
An organism’s inherited physical appearance is considered their _____________________.
Circle what would be an example:
Blue eyes
Brown Hair
BB
curly hair
bb
Bb
Purebred- Another word for ________________. When an organisms has two alleles that are
the _____________ for a trait.
Hybrid- Another word for ________________. When an organisms has two alleles that are
the _____________ for a trait.
Discuss at least 2 differences between a dominant vs. a recessive trait.
_______________________________________________________________________
_______________________________________________________________________.
Sex Chromosomes:
XX - ____________________
(male/female)
XY ____________________
(male/female)
There is a __________% chance that a baby will be a boy or a girl
Mitosis vs. Meiosis:
Mitosis is the division of DNA in eukaryotic body cells. Human body cells have _______ pairs of
chromosomes, or __________ total.
Meiosis is the formation of eukaryotic sex cells. It includes _____ divisions of the DNA.
Human egg and sperm cells each have ________ chromosomes so that when they combine, the
first cell of the offspring (zygote) will have the correct total number of human chromosomes.
Important People:
-
__________________ developed a square that is used to visualize all the possible
combinations of alleles in offspring resulting from a genetic cross.
- ________________________ is considered the father (first
to discover) of genetics. He used ______________ to
study the way traits are passed from one generation to the
next
Punnett Squares Practice:
Here Cross
RR x Rr
Let R =tongue rolling
Let r = can’t tongue roll
Here Cross
Rr x Rr
% Can tongue roll
% Can tongue roll
_______
_______
% Can’t tongue roll
% Can’t tongue roll
________
________
Possible Genotypes of the offspring:
___________________________
Possible Genotypes of the offspring:
_________________________________
Possible Phenotypes of the Offspring:
____________________________
Possible Phenotypes of the offspring:
_________________________________
Dihybrid Cross (predicting 2 traits)
In dogs, the allele for a long tongue (L) is dominant over the allele
for a short tongue (l). Also the allele for black hair (B) is
dominant over the allele for brown hair (b).
Suppose two dogs were cross who were heterozygous for both traits. Predict the types and
ratios of the phenotypes and genotypes of the offspring.
Parents Genotype: ____________ x
_______________
Gametes
What is the ratio of black hair long tongue dogs to brown hair dogs to brown hair short tongue
dogs?