Two phenotypically normal individuals have an affected child. What can we conclude about the parents?
1. they both carried the diesease allele
2. they are not the parents of the child
3. they are affected
4. no conclusions can be drawn
An individual with AaBb genotype is producing four types of gametes as AB, aB, Ab and ab by meiosis. If the frequency of these gametes is 25% each then, it explains
1. Incomplete linkage
2. Mutations
3. Independent assortment
4. Complete linkage
Which one of the following Mendelian trait controlling unit is expressed in homozygous condition only?
1. Axial flower
2. Yellow seed
3. Yellow pod
4. Smooth seed
A pure tall - red flower plant was crossed with dwarf - white-flowered plant. In , all were tall with pink flowers. What is the percentage probability of getting red and pink-flowered plants respectively?
1. 25% and 50%
2. 50% and 25%
3. Zero and 75%
4. Zero and 50%
Which one of the following traits are controlled by genes located on the differential part of X-chromosome?
1. Porcupine skin and epidermolysis bullosa
2. Beard in man and milk glands in female
3. Color blindness and hemophilia
4. Color blindness and cystic fibrosis
In pea, the gene that controls starch synthesis shows all of the following except
1. Dominance
2. Incomplete dominance
3. Multiple allelism
4. Pleiotropy
What is incorrect for genetic maps?
1. Alfred Sturtevant prepared it for the first time using monohybrid test cross
2. It is a measure of the distance between genes present on the same chromosome
3. Stronger the linkage lesser is the distance between two genes
4. It was extensively used in the case of the Human Genome Sequencing Project
Match the column correctly
Column l Column ll
a. Phenylketonuria i. Autosomal trisomy associated with mongolism
b. Down's syndrome ii. Gynaecomastia
c. Klinefelter's syndrome iii. Autosomal recessive trait associated with mental retardation
d. Turner's syndrome iv. Sterile females with rudimentary ovaries
1. a(iii), b(i), c(iv), d(ii)
2. a(ii), b(iii), c(i), d(iv)
3. a(ii), b(i), c(iii), d(iv)
4. a(iii), b(i), c(ii), d(iv)
All are X-linked traits, except
1. Colourblindness
2. Haemophilia
3. Deficiency of glucose-6-phosphate dehydrogenase
4. Hypertrichosis
If we change the position of genes on chromosomes it will be included in
1. Gene mutation
2. Chromosomal mutation
3. Polyploidy
4. Transversion mutation