Mendel's Monohybrid Experiment

Q. How many different phenotypes and genotypes are obtained in Mendel’s ${\text{F}}_2$ generation of dihybrid cross?

Q.

What is scientific name of pea-plant?

Q. Alternative forms of genes which occupy same position on chromosomes are called .

1. alleles
2. DNA
3. RNA

Q.

What Is the Phenotype Frequency?

Q. The genotypic ratio obtained in the ${\text{F}}_2$ generation of Mendel’s monohybrid cross was ___.

1. 3:1
2. 3:1:2
3. 2:3
4. 1:2:1

Q. In Mendel’s experiments, the ${\text{F}}_1$ progeny resembles either of the two parents. The character that was not visible in this generation was:

1. Recessive
2. Dominant
3. Wild
4. Superior

Q.

What are the functions of genes in DNA

Q.

What is the length of DNA called?

Q.

Recessive character appears in $25\%$ of the ${\text{F}}_2$ progeny in Mendel’s monohybrid cross.

1. True

2. False

Q. The most striking example of frameshift mutation was found in a disease called as

1. Sickle cell anaemia
2. Colour blindness
3. Leshc-Nyhan Syndrome
4. Thalassemia

Q. In a monohybrid cross, what is the phenotypic ratio in the F2 generation?

1. 2:2
2. 3:1
3. 1:2
4. 2:3

Q. Match the following pea phenotypes to their respective genotypes.

1. Tt
2. TT
3. tt

Q. If a normal women marries an albino man, their offspring are half albino and half normal, the women is

1. Homozygous normal
2. Homozygous recessive
3. Heterozygous normal
4. Homozygous dominant

Q. Why organisms are different from other organisms

​​​​​

Q. How many different phenotypes and genotypes are obtained in Mendel’s ${\text{F}}_2$ generation of dihybrid cross?

Q.

Choose the dominant traits in pea plants.
Round seed, Constricted pod, Axial flower, Green seed, Wrinkled seed, Yellow seed, Dwarf plant, Green pod

Q. In which of the following there is no defect in the sex chromosome?

1. Down's syndrome
2. Turner's syndrome
3. Colour blindness
4. Klinefelter's syndrome

Q. Mendel began his research using garden peas but ultimately settled on mice as his model system.

1. True
2. False

Q. Child suffering from 'gene mutational disorder' leads to death at the age of $4$ years after series of opportunities infections. Identify the disorder?

1. AIDS
2. SCID
3. IDDM
4. Tay-sach's disease

Q. Trisomy of $21$st chromosome results in

1. Down's syndrome
2. Turner's syndrome
3. Sickle cells anaemia
4. Klinefelter's syndrome

Q. Match the following terms in genetics to their respective defining words.

1. Identical alleles
2. External appearance
3. Genetic makeup
4. Different alleles

Q. Identify the recessive traits in a pea plant.

1. White flower
2. Purple flower
3. Yellow seed
4. Green seed
5. Wrinkled seed
6. Round seed
7. Green pod
8. Yellow pod
9. Tall plant
10. Dwarf plant

Q. Select the dominant physical traits in humans.

1. Brown eyes
2. Blue eyes
3. Curly hair
4. Straight hair
5. Normal vision
6. Colour blind
7. Right handedness
8. Left handedness
9. Free earlobe
10. Attached earlobe

Q. There is trisomy of chromosome $13$ which is characterised by mental retardation, sloping forehead, deformed face, polydactyly, cardiac defects, etc. The syndrome is?

1. Klinefelter's syndrome
2. Patau's syndrome
3. Edward's syndrome
4. Turner's syndrome

Q. Why is it said that marriages between close relatives is dangerous for the next generation?

Q. Sex influenced characters are due to which of the following genes?

1. X linked genes
2. Y linked genes
3. Autosomal genes
4. Y linked gene modification

Q. By cross pollinating certain tobacco species, some fertile hybrids were obtained by

1. Mendel
2. Kolreuter
3. Khorana.
4. Morgan

Q. What is the phenotypic ratio of offsprings in monohybrid cross?

1. 1:2:1
2. 3:1
3. 3:3:1:1
4. 2:1

Q. The phenotypic ratio of the monohybrid cross for tall:dwarf in the F2 generation is

1. 3:1
2. 1:2:1
3. 1:3
4. 1:1

Q.

A cross is made between true breeding lines of pea plants with axillary (A) and terminal (a) flowers. What is the ratio between the number of possible genotypes of homozygous and heterozygous plants in ${\text{F}}_2$ progeny?

1. 3:1

2. 1:2:1

3. 1:1:2

4. 1:1