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WorksheetsMendelian Genetics
Total questions: 20
Worksheet time: 1hrs 2mins
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
Which of the following traits of a dog is inherited from its parents?
the presence of fleas in its fur
the color of its fur
the ability to sit up and beg
the habit of barking to go outside
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 couple has three brown-eyed children. The parents are brown-eyed (Bb). The allele for brown eyes is dominant over the allele for blue eyes. They believe the fourth child they have will be blue-eyed. Which statement below explains what actually will happen?
The couple will have a blue-eyed fourth child.
The couple will have a brown-eyed fourth child.
They have a 75% chance of having a blue-eyed child.
They have a 25% chance of having a blue-eyed child.
Chickens can have different types of feathers. Frizzled feathers curl toward a chicken’s head. Assume that feather type is determined by a single gene and that the allele for frizzled feathers is dominant over the allele for straight feathers. In a cross between two chickens with straight feathers, what percentage of the offspring can be expected to have frizzled feathers?
0%
25%
50%
100%
In guinea pigs Black fur (B) is dominant to white(b), cross Bb x bb and determine genotypic ratio for offspring
2:2
0:2:2
1:2:1
2:2:0
In the punnett square below, what belongs in the missing square
Objective #5
(B-brown eyes & b-blue eyes)
Cross (Dad)Bb X (Mom)BB.
List the possible genotypes from this cross.
BB, Bb, bb
BB
BB, Bb
bb,Bb
RR X Rr
B = short
b = long
What genotype would a heterozygous short haired guinea pig have?
In labrador retrievers the allele for a black coat color (B) is dominant over the allele for a brown coat color (b). If a brown labrador retriever is crossed with a heterozygous black labrador retriever, which of the following genotypic ratios can be expected?
0 BB: 2 Bb: 2 bb
1 BB: 2 Bb: 1 bb
2 BB: 0 Bb: 2 bb
2 BB: 1 Bb: 0 bb
parent 2: ggBb
Find the gametes for parent 1.
