WorksheetsGenetics Middle School
Total questions: 25
Worksheet time: 2hrs 1mins
Which of the following is true about Mendel?
His ideas about genetics apply equally to plants and animals.
He believed that genetic traits of parents will usually blend in their children.
His discoveries concerning genetic inheritance were generally accepted by the scientific community when he published them during the mid 19th century.
Mendel believed that the characteristics of pea plants are determined by the:
inheritance of units or factors from both parents
relative health of the parent plants at the time of pollination
inheritance of units or factors from one parent
a mixing of thing
What were the parents in the P1 generation in Mendel's experiments? Click all that apply.
Homozygous dominant
Heterozygous
Homozygous recessive
Hybrid
What was the phenotype for all of the plants in Mendel's F1 generation?
All dominant trait
All recessive trait
Half dominant and half recessive traits
75% dominant and 25% recessive traits
What was/were the genotype (s) for all of the plants in Mendel's F2 generation?
All homozygous dominant
All homozygous recessive
All heterozygous
25% homozygous dominant, 50% heterozygous and 25% homozygous recessive traits
50% heterozygous, 50% homozygous recessive
What was/were the phenotype (s) for all of the plants in Mendel's F2 generation?
All dominant trait
All recessive trait
Half dominant and half recessive traits
75% dominant and 25% recessive traits
Indicate whether the genotype is heterozygous or homozygous - GG
homozygous
heterozygous
Indicate whether the genotype is heterozygous or homozygous - Bb
homozygous
heterozygous
Indicate whether the genotype is heterozygous or homozygous - nn
homozygous
heterozygous
Purple flowers are dominant to white. Given a genotype of Pp determine the phenotype.
purple
white
Bobtails are recessive (long tails dominant). Given a genotype of tt determine the phenotype.
long tail
bobtail
Straight hair is dominant to curly. List the possible genotypes for straight hair. Click all that apply.
SS
Ss
ss
In pea plants purple flowers are dominant to white flowers. If two white flowered plants are cross, what percentage of their offspring will be white flowered? ______
0%
25%
50%
75%
100%
Set up the square for the crosses listed below. The trait being studied is round seeds (dominant) and wrinkled seeds (recessive). Rr X rr What is the percentage of offspring that will be round?
0%
25%
50%
75%
100%
Punnett squares are used by geneticists to determine the probability of different offspring genotypes. In the one shown below, what letter(s) belong in the lower right box?
AA
Aa
aa
Punnett squares can be used to predict the probability of:
being exposed to a contagious disease and contracting it
having an inherited disease or a genetically determined physical trait
both of the above
If two people who are both carriers (which means they are heterozygous) for a genetically inherited fatal recessive disease decide to become parents, what will be the odds that their children will also be carriers (again this means heterozygous)?
1 out of 4
2 out of 4
3 out of 4
4 out 4
In guinea pigs, the allele for short hair is dominant. What genotype would a heterozygous short haired guinea pig have?
SS
Ss
ss
OOmpas generally have gray faces, which is caused by a dominant gene. The recessive condition results in an orange face. A gray faced OOmpah (homozygous) is married to an orange faced Oompah. They have 8 Oompah children. How many of those children will have gray faces?
0%
25%
50%
75%
100%
OOmpahs can have red (R), blue (B), or purple hair. The allele that controls this trait is INCOMPLETELY DOMINANT, where purple hair is caused by the heterozygous condition. What is the probability of having a purple haired baby from two parents that are both purple haired?
0%
25%
50%
75%
100%
If a woman is homozygous normal and her husband is heterozygous for a genetically inherited recessive disease and they decide to become parents, what is the probability that they will have a healthy child?
0%
25%
50%
75%
100%
If two parents are heterozygous for a genetically inherited dominant trait, what is the probability that they will have a child together who has this trait in his or her phenotype?
0%
25%
50%
75%
100%
When a capital letter is used, what kind of allele is most often being represented?
recessive allele
codominance
punnett square
dominant allele
If a heterozygous chicken has both black and white feathers, they have neither a dominant or recessive trait, and both alleles express themselves independently in the phenotype. What is this called?
A black and white chicken
Incomplete dominance
Complete dominance
Codominance
A heterozygous chicken with both black and white feathers, mates with a rooster that is homozygous for black. What are the possible offspring these parents can have, giving both the genotype and the phenotype.
100% All black and white chickens
50% black and white and 50% black chickens
50% black and white and 50% white chickens
100% white chickens
