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WorksheetsRevision chapter 4 & 5
Total questions: 20
Worksheet time: 3600secs
Some people experience PTC paper on tongue as bitter, others as tasteless. This character is hereditary in nature. Suppose T stands for dominant gene of ability to taste and t for recessive gene, the genetic make up of a person who cannot taste is
TT
Tt
tt
None of these
Genotype of dominant plant can be determined by
pedigree analysis
back cross
test cross
dihybrid cross
After cross-fertilization of true-breeding tall and dwarf plants, the F1 generation was self-fertilized. The resultant plants have genotype in the ratio
1:2:1 (homozygous tall : heterozygous tall : dwarf)
1:2:1 (heterozygous tall : homozygous tall : dwarf)
3:1 (tall : dwarf)
3:1 (dwarf : tall)
If both genotype and phenotype shows the same ratios of 1:2:1 in the F2 generation, it shows
incomplete dominance in monohybrid cross
complete dominance in monohybrid cross
dihybrid cross
co-dominance
Test cross determines
whether two traits are linked or not
the genotype of F2 plant
whether the two species will breed successfully or not
number of alleles in a gene
Lack of independent assortment of two genes is due to
recombination
crossing over
linkage
repulsion
A man suffering from a hereditary disease married a healthy woman. They got 5 children, three girls and two boys. All the girls inherited their father’s disease. What is the type of the disease inheritance?
Multiple allele
Polygenes
Codominance
Sex-linked genes
One of the parents is suspected of having phenylketonuria recessive gene. What is the risk of giving birth to a child with inborn phenylketonuria?
25%
50%
75%
100%
A couple has two children. One child has blood type A and the other has blood type O. What are all the possible blood types of the parents?
Either both have type A or one has type A and other has type O or one has A and the other has type B
There is only one possibility, both parents have type A blood
There is only one possibility, both parents have type O blood
There is only possibility, one parent has type A and the other has type O
A man with haemophilia marries a woman who has normal haemoglobin and is not carrier? Which of the following is true?
None of their children will have the disease nor will they be carriers
All the boys will have the disease
All the girls will have the disease
All the girls will be carriers
A woman with normal colour vision whose father was red-green blind, married a red green colour-blind man. Colour blind is X-linked genes disease. What is the probability of her first-born child being red green colour blind?
1.0
0.75
0.50
0.25
In a population of cows at genetic equilibrium, 1500 cows have dominant grey coat, while the remaining 500 cows have recessive white coat. If all the white coat cows were sold and the remaining cows were left to breed randomly, what is the number of white coat cows in the next generation of 1000 cows?
109
250
442
500
Which of these factors that is the main cause of change in gene pool?
mutation occur
migration occur
genetic drift occur
the population size is small
In a population of 250 rats, the recessive allele frequency of short fur is 0.25. What is the dominant allele frequency in the next generation if the population is considered to be in genetic equilibrium?
0.25
0.5
0.3
0.75
In a population of 1000 dragonfly, 80% alleles are dominant. What is the frequency of recessive allele?
0.8
0.2
20%
80%
Within a population of 500 butterflies, the color purple is dominant over the color white. 200 of the butterflies are white. What is the frequency of homozygous dominant individuals? Give your answer as a decimal to the nearest hundredth.
.40
.36
.16
.60
