Q. No.T. H. Morgan worked on the fruit fly, Drosophila melanogaster. Which of the following is not an advantage of this fly?
1.
They could be grown on a simple synthetic medium in the laboratory.
2.
They complete their life cycle in about two years, and a single mating could produce a large number of progeny flies.
3.
There was a clear differentiation of the sexes – the male and female flies are easily distinguishable.
4.
It has many types of hereditary variations that can be seen with low-power microscopes.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
In true breeding, the allelic pair of genes are:
| 1. | Homologous | 2. | Linked |
| 3. | Stable | 4. | Homozygous |
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
What proportion of progeny in F2 generation in a Mendel monohybrid cross resembled the parent [of P generation] that expressed the recessive trait?
| 1. | ¼ | 2. | ½ |
| 3. | ¾ | 4. | 2/3 |
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
During his observation of spermatogenesis in a few insects, Henking found that a nuclear structure was received by 50 % of the sperms. He called this structure as:
| 1. | X – body | 2. | Y–body |
| 3. | X – chromosome | 4. | Y – chromosome |
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
The expression of only one of the parental characters in a monohybrid cross in the F1, the expression of both in the F2 and the proportion of 3:1 obtained at the F2 can be explained by:
1. Law of Dominance
2. Law of segregation
3. Law of Independent Assortment
4. Two-factor interaction
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
Which of the following is not an X – linked recessive disorder in humans?
| 1. | Red-green colour blindness |
| 2. | Haemophilia |
| 3. | Duchenne muscular dystrophy |
| 4. | Vitamin D-resistant rickets |
When there is a change in the chromosome number such that the changes number is not an exact multiple of base number [haploid number], the condition is called as:
| 1. | Euploidy | 2. | Aneuploidy |
| 3. | Aberration | 4. | Non-disjunction |
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
On self-pollinated a tall F2 plant, the progeny can be:
| 1. | Tall only | 2. | Dwarf only |
| 3. | Intermediate in height | 4. | Tall and Dwarf |
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
Mutations that arise due to changes in a single base pair of DNA are called as:
| 1. | Chromosomal aberrations | 2. | Point mutations |
| 3. | Nonsense mutations | 4. | Frameshift mutations |
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
The inheritance of IA and IB allele exhibit:
| 1. | Complete dominance | 2. | Incomplete dominance |
| 3. | Co-dominance | 4. | Lethality |
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
© 2024 GoodEd Technologies Pvt. Ltd.