WorksheetsGenetics
Total questions: 20
Worksheet time: 19mins
Which of the following is a homozygous dominant for brown eyes?
bb
BB
bB
Bb
If the dominant trait is having brown eyes (B) and the recessive trait is having blue eyes(b). What allele combination(s) below would represent a person who has brown eyes?
bB
bb
BB
Bb
A (a) cross involves one trait.
A (a) involves two traits
A grid system for predicting all the possible genotypes resulting from a cross.
Mendel's law
genotype
alleles
If you cross a homozygous dominant and a homozygous recessive, you get:
(genotype ratio)
1:2:1
3:1
0:4:0
2:1
If you cross a homozygous dominant and homozygous recessive you get:
all heterozygous
All homozygous dominant
all homozygous recessive
50% dominant 50% recessive
If we cross 2 heterozygous we get:
(phenotype ratio)
2:1;1
1:2:1
3:1
2:2
If we cross 2 heterozygous you get:
100% heterozygous
50% homozygous dominant
25% heterozygous
25% homozygous recessive
50% heterozygous
25% homozygous dominant
25% homozygous recessive
50% dominant
50% recessive
How is a recessive alleles represented?
by lowercase letters
by uppercase letters
by a big letter and a little letter
by a dominant allele
when is a dominant allele expressed?
when only lowercase letters are represented
when 2 uppercase letters are represented
when an uppercase letter and a lowercase letter is represented
when a lowercase letter comes before the uppercase letter
How is a dominant allele represented?
by lowercase letters
by uppercase letters
by a big letter and a little letter
by a dominant allele
Being able to taste PTC is a dominant trait. if you cant taste
PTC then that trait is (a) .
not being able to taste PTC is the genotype is recessive.
If you can taste PTC then the phenotype is (a) .
The genotypes HH and hh are (a) .
The genotype Hh is (a) .
What will happen if one dominant allele or two dominant alleles are inherited for a trait?
The trait will not be expressed
No trait would be expressed.
A Phenotype is...
A genetic makeup
a physical characteristic
Recessive
Dominant
A Genotype is...
A genetic makeup
a physical characteristic
Recessive
Dominant
L=long hair
l= short hair
If you cross a dog with dog and a dog with ll what fraction of the offspring
would be expected to have long hair
100%
25%
50%
75%
