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WorksheetsMendelian Genetics
Total questions: 13
Worksheet time: 24mins
In sheep, eye color is controlled by a single gene with two alleles. When a homozygous brown-eyed sheep is crossed with a homozygous green-eyed sheep, blue-eyed offspring are produced. If the blue-eyed sheep are mated with each other, what percent of their offspring will most likely have brown eyes?
0%
25%
50%
75%
100%
Probability that the genotype ccdd will be produced by the parents CcDd x CcDd
0
1/16
1/4
1/2
3/4
A man with brown eyes marries a woman with blue eyes. They have 12 brown-eyed children. State the genotypes of the man and his wife.
bb x bb
Bb x Bb
BB x BB
BB x bb
BbCc x BbCc
A male and female have 3 offspring all of which are female. The couple is now pregnant again. What is the chance the next is female.
1/16
1/4
1/3
1/2
3/4
Reconstruct the order of the gene map based on the recombination frequencies listed below.
ABCD
BCBA
BADC
BADA
BACD
Genes S and T are not linked. If there is a 50% probability that allele S is in a gamete and there is a 50% probability that allele T is in a gamete, what is the probability that both are in the same gamete?
5%
25%
50%
75%
100%
The trait for tall pea plants is (T) and the trait for short pea plants is (t). The trait for smooth peas is (S) and the trait for wrinkled is (s). Two plants are crossed yielding an F1 generation with 612 tall plants with smooth peas and 188 short plants with wrinkled peas. Which of the following is the most likely genotype of the parent generation?
ttss x ttss
TTss x TTss
TtSs x TtSx
TTSS x ttss
TtSS x Ttss
A child is born with the blood type B. The mother of the child is blood type O. Which of the following statements is most correct?
The father must be type B
The father could be type AB
The father passed along a recessive allele
The mother could have passed along a type B allele
The mother could have passed along a dominant allele
If traits X, Y, and Z are consistently inherited together, which of the following best explains why this is the case?
These 3 traits are all dominant.
The parents both carry the dominant form of each trait.
These 3 traits are located on different chromosomes
These 3 traits are located close to each other on the same chromosome.
These 3 traits are located far from each other on the same chromosome.
Hemophilia is a sex-linked recessive trait. A male hemophiliac and phenotypically normal female have a girl that is a hemophiliac. All of the following statements are correct EXCEPT:
The daughter inherited a recessive gene from each parent.
The daughter inherited a dominant allele from her mother.
The mother is a carrier of hemophilia
The genotype of the mother is X^H X^h
The genotype of the father is X^h Y
A red flower and a white flower produce a pink flower
Codominance
Multiple alleles
Incomplete Dominance
A red flower and a white flower produce a red and white streaked flower
Codominance
Multiple alleles
Incomplete Dominance
Imagine an isolated species of caterpillars with five distinct color variations living in a prescribed area. Many counts of these caterpillars revealed that the colors were equally balanced. In July a count of 50caterpillars revealed:
10 green 10 yellow 10 brown 10 white 10 red
Also in July a species of bird that preys on caterpillars was introduced in the area of the caterpillar population. After two months the caterpillar population had dropped, and when the count was done, the color variations were no longer balanced. The following results were obtained from a random count of 25 caterpillars in early September:
10 green 5 yellow 7 brown 1 white 2 red
Part A: Using chi-square, determine if the color variations found in the September count could be due to chance, or if some other factor influenced results.
Part B: What was the most likely influence in the results revealed in the September count?
Part C: Propose a possibility of what may happen to the caterpillar color variations if the birds and caterpillars remain in the area for five years and explain the biological significance of this outcome.
