Conditions of a karyotype 2n +1, 2n –1 and 2n + 2, 2n – 2 are called:
1. | Aneuploidy | 2. | Polyploidy |
3. | Allopolyploidy | 4. | Monosomy |
If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is:
1. | Autosomal dominant | 2. | Autosomal recessive |
3. | Sex-linked dominant | 4. | Sex-linked recessive |
In a certain taxon of insects, some have 17 chromosomes and others have 18 chromosomes. The 17 and 18 chromosome-bearing organisms are:
1. males and females, respectively
2. females and males, respectively
3. all males
4. all females
The inheritance pattern of a gene over generations among humans is studied by pedigree analysis. The character studied in the pedigree analysis is equivalent to:
1. | quantitative trait | 2. | Mendelian trait |
3. | polygenic trait | 4. | maternal trait |
It is said that Mendel proposed that the factor controlling any character is discrete and independent. His proposition was based on the:
1. | results of the F3 generation of a cross |
2. | observations that the offspring of a cross made between the plants having two contrasting characters shows only one character without any blending |
3. | self-pollination of F1 offspring |
4. | cross-pollination of F1 generation with recessive parent |
In a plant, red fruit (R) is dominant over yellow fruit (r), and tallness (T) is dominant over shortness (t). A plant with RRTt genotype is crossed with a plant of rrtt genotype. The progeny is:
1. All red fruit, tall 25%
2. All red fruit, tall 50%
3. All red fruit and tall 75%
4. All red fruit and tall.
Which of the following is the most suitable medium for the culture of Drosophila melanogaster?
1. | Cow dung | 2. | Moist bread |
3. | Agar agar | 4. | Ripe Banana |
A human male produces diallelic sperms in equal proportion AB, Ab, aB, and ab. The genotype of the person would be:
1. | Aa Bb | 2. | Aa BB |
3. | AA Bb | 4. | AA BB. |
The most popularly known blood grouping is the ABO grouping. It is named ABO and not ABC, because “O” in it refers to having:
1. | No anitgens A and B on RBCs |
2. | Other antigens besides A and B on RBCs |
3. | Overdominance of this type on the genes for A and B types |
4. | One antibody only - either anti-A or anti-B on the RBCs |
A normal-visioned man whose father was colour-blind, marries a woman whose father was also colour-
blind. They have their first child as a daughter. What are the chance that this child would be colour–blind?
1. | 100% | 2. | zero percent |
3. | 25% | 4. | 50% |