Pedigrees
Single Trait Crosses
Vocab
Two Trait Crosses
Extra Practice
100
In the pedigree above, shaded in individuals are colorblind. How many affected females are there?
0
100
Two homozygous dominant mice are crossed. What percentage of offspring will be homozygous dominant?
100%
100
The letters BB, CC, ZZ would be considered what?
Homozygous dominant
100
In a two trait cross, give an example of a parent genotype
Example of anything with two traits - for example, AaBb
100
Gg - green body color
Ff - four fingers
200
I
Two little letters
200
In squash, yellow fruit color (YY or Yy) is dominant over orange fruit color (yy). Cross a heterozygous yellow fruit with an orange fruit.
What is the phenotypic ratio of the offspring?
2 yellow : 2 orange
200
The genotypes Hh and TtSs would be considered what?
Heterozygous
200
What does FOIL stand for?
First, Outer, Inner, Last
200
Two heterozygous brown mice are crossed. What percentage (or fraction) of offspring would you expect to be brown?
75% (or 3 out of 4, 3/4)
300
How many generations are in this pedigree?
4
300
In pea plants, smooth peas are dominant over wrinkled peas. What is the genotypic ratio of the offspring of the cross between two heterozygous smooth pea plants?
1SS : 2 Ss : 1 ss
300
Unattached earlobes, hitchhikers thumb, brown hair are all considered what?
Phenotypes
300
If a parent has the genotype TtHh, what are the possible gametes (letters) that this parent can produce?
TH, Th, tH, th
300
What is the relationship between I-1 and III-4?
Grandfather/granddaughter
400
How many children did couple I-1 and I-2 have?
3
400
Cross a homozygous dominant brown mouse with a heterozygous brown mouse (tan is the recessive color) Brown = B Tan = b
What percentage or fraction of the offspring mice will be brown?
100% or 4 out of 4
400
A family tree that shows how a trait is passed from generation to generation is called what?
Pedigree
400
In this Punnett Square, what is the phenotypic ratio of yellow to green peas?
12 yellow : 4 green
400
If AaBb is crossed with aabb, what proportion of the offspring would be expected to be aabb?
a. 9/16
b. 2/16
c. 4/16
d. 1/16
4/16
500
Heterozygous
500
Sickle cell anemia is a blood disorder. A mother has sickle cell anemia, a recessive disorder and a father is heterozygous for the trait.
What percentage of their offspring are likely to have the disease?
50% (2 out of 4)
500
A diagram that shows the possible outcomes of a genetic cross between two parents is known as what?
Punnett square
500
B stands for black hair, bb for brown and E stands for long ears, ee for floppy ears in rabbits. Two parents are crossed: BBee x bbEe
In the bottom right corner of the Punnett Square, what does that rabbit look like?
Black hair and floppy ears
500
Whenever a capital letter is present, a red color is produced. In a cross of AaBb x AaBb, how many red offspring would you expect out of 16?
a.1
b.3
c.9
d.15
d.15