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WorksheetsMendelian Genetic Quiz
Total questions: 15
Worksheet time: 8mins
In a cross between two heterozygous purple pea plants (Pp), what is the probability that an offspring will have white flowers (pp)?
0%
25%
50%
75%
Why does a "carrier" of a recessive genetic disorder not show any symptoms of the disease?
The dominant allele produces enough functional protein to mask the recessive one.
The recessive allele is destroyed by the dominant allele.
The carrier only has one chromosome.
The environment prevents the recessive gene from activating.
In a Punnett square, what do the letters placed on the outside of the box represent?
The possible genotypes of the offspring.
The actual phenotypes of the offspring.
The haploid alleles found in the parents' gametes.
The diploid mutations in the parents' body cells.
A scientist crosses a homozygous dominant tall plant (TT) with a homozygous recessive short plant (tt). What will the phenotypic ratio of the F1 generation be?
3 tall : 1 short
1 tall : 1 short
All tall
All short
If you perform a cross between Bb and bb and produce 200 offspring, approximately how many would you expect to show the recessive phenotype?
50
100
150
200
Two parents with brown eyes (Bb) have a child with blue eyes (bb). Which piece of evidence best supports the claim that blue eyes are recessive?
The child looks more like the mother.
Both parents carry a "hidden" allele that was passed to the child.
The blue eye trait is stronger than the brown eye trait.
Brown eyes are a mutation of blue eyes.
If a breeder crosses two black labs and gets a yellow puppy, which question is most scientifically valid to ask?
Did the puppy change color because of the sun?
Are both parents heterozygous for the fur color gene?
Is yellow fur a dominant trait?
Why did the Punnett square fail to work?
In Mendelian genetics, an organism with two of the same alleles is called ________
Homozygous
Heterozygous
Hemizygous
If a dominant allele is present in a genotype, the __________ phenotype will always be expressed.
Dominant
Recessive
Intermediate
A Punnett square is a model used to predict the ___________ of an offspring's genotype.
Probability
Certainty
History
In a cross between Aa×Aa, the genotypic ratio is ________.
1:2:1
3:1
4:0
If the top of a Punnett square has T and t, and the side has t and t, one of the boxes must contain the genotype _______. Check all possible genotypes.
TT
Tt
tt
Tt and tt
In a test cross of a purple flower (P?) with a white flower (pp), half the offspring are white. The unknown genotype of the purple parent must be _______.
PP
Pp
pp
Cannot be determined
The physical appearance or observable trait of an organism is known as its _______.
Genotype
Phenotype
Allele
Karyotype
If a Punnett square shows a 75% chance for a dominant trait, the fraction of offspring expected to show that trait is _______.
1/2
3/4
1/4
1
