WorksheetsMendelian Genetics & Punnett Squares
Total questions: 25
Worksheet time: 30mins
The passing of genetic traits from parent to offspring is known as
heredity
trait
gene
allele
An organism's appearance or other detectable characteristic
genotype
phenotype
genetics
heterozygous
Mendel proposed that traits observed in pea plants resulted from a combination of "factors" inherited from each parent. His description of these "factors" can be considered the first scientific definition of the role of —
ribosomes
meiosis
genes
cell nuclei
An organism's genetic makeup, allele combination
phenotype
genotype
heterzygous
allele
Having two of the same genes for the trait (sometimes called purebred).
homozygous
hetrozygous
protein
chromosome
Having two different genes for a trait (sometimes called hybrid).
protein
homozygous
heterozygous
genotype
Which of the following genotypes is homozygous recessive?
Tt
tt
TT
T
Which of the following genotypes is homozygous dominant?
BB
Bb
bb
D-dimples d- no dimples
Cross (Dad) Dd X (Mom) DD.
List the possible genotypes from this cross.
DD, Dd, dd
DD
DD, Dd
dd, Dd
Start with the P generation with the following genotypes (AA x aa). Based on classical Mendelian inheritance, how will a cross between two homozygous parents, one dominant, one recessive, influence future generations?
The F1 generation will show an even split between the dominant phenotypes and the recessive genotype.
The F1 generation will show the dominant trait and future crosses will continue to produce genotypes expressing the dominant trait.
Although the F1 generation will all show the dominant trait, the offspring will all be heterozygous and increase the chances of future variation.
The F1 generation will show a mix of the dominant phenotype and recessive phenotype and over generations, the recessive trait will increase in number.
A red flower (Rr) is crossed with a white flower (rr). What is the genotypic ratio?
0 RR; 0 Rr: 4 rr
2 RR; 0 Rr: 2 rr
4 RR; 0 Rr: 0 rr
0 RR; 2 Rr: 2 rr
In sheep, the allele for belly fur (A) is dominant to the allele for no belly fur (a): A mother with the genotype Aa and a father with the genotype Aa produce an offspring. What is the percent chance that the offspring will have NO belly fur?
0%
25%
50%
75%
100%
In sheep, the allele for belly fur (A) is dominant to the allele for no belly fur (a): Two sheep with no belly fur mate and produce offspring. What is the percent chance that the offspring will have belly fur?
0%
25%
50%
75%
100%
In sheep, the allele for belly fur (A) is dominant to the allele for no belly fur (a): A mother that is homozygous dominant for belly fur mates with a heterozygous father. What percent of the offspring will be homozygous dominant for belly fur?
0%
25%
50%
75%
100%
In goats, a recessive gene causes the goats to "faint" when they are startled: A farmer breeds two goats that have never fainted and their first offspring faints two days after its birth. What must the parent's genotypes have been?
Heterozygous (Ff).
Homozygous Dominant (FF).
Homozygous Recessive (ff).
Impossible to know.
In humans, tongue rolling is a dominant trait (R), those with the recessive condition cannot roll their tongues (r). Bob can roll his tongue, but his mother could not. He is married to Sally, who cannot roll her tongue. What is the probability that their first-born child will not be able to roll their tongue?
0%
25%
50%
75%
100%
