MCQ
Haploids are preferred over diploids for mutation studies because:
- ✓Recessive mutation is expressed in $\mathrm F_1$.
- BRecessive mutation is expressed in $\mathrm F_2$.
- CDominant phenotype is expressed.
- DDominant phenotype is suppressed.
✓
Answer
Correct option: A.
Recessive mutation is expressed in $\mathrm F_1$.
Dominant mutations are the one that expresses themselves in heterozygotes as well as in homozygous dominant genotypes; thus a cross between two pure breeding genotypes produces the dominant phenotype in $\mathrm F_1$ hybrid. This means that dominant mutations are expressed in successive generations of diploids; options $C$ and $D$ are incorrect in respect to the question. Recessive mutations are suppressed by the presence of wild$-$type dominant alleles in diploids and are expressed only in recessive homozygotes; their detections need development of hybrid line by the cross between two pure varieties followed by selfing of hybrid to obtain recessive homozygotes in $\mathrm F_2$ generation. Since haploids carry a single copy of allele for a gene, they express both dominant and recessive mutations in successive generations which makes option $B$ incorrect and option $A$ correct.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The primary biological importance of sex in organisms is that it
Match List $- I$ with List $- II$ with respect to methods of Contraception and their respective actions.
| List$-I$ | List $- II$ |
| $(a)$ Diaphragms | $(i)$ Inhibit ovulation and Implantation |
| $(b)$ Contraceptive | $(ii)$ Increase phagocytosis of sperm within Uterus |
| $(c)$ Intra Uterine Device | $(iii)$ Absence of Menstrual cycle and ovulation following parturition |
| $(d)$ Lactational | $(iv)$ They cover the cervix blocking the entry of sperms |
Choose the correct answer from the options given below:
What is true in the process of fertilization
In Operon concept, the regulator gene regulates chemical reactions in the cell by
Neanderthal man:
Methanogens do not produce:
Antibiotics are produced by
Rosie's milk is enriched nutritionally as it has:
Which of the following is not found in maize seed: