Rediscovery of Mendelism

Q. Which of the following is an exception to Mendel’s laws?

1. Purity of gametes
2. Dominance
3. Linkage and crossing over
4. Independent assortment

Q.

Eugenics is the study of ____________.

Q.

What is the study of heredity called?

Q. The work of Mendel remained unnoticed for 34 years because

1. partly his ideas were ahead of his time
2. partly he published his work in an obscure journal
3. both correct
4. both wrong

Q. Which one of the following crosses shows phenotypic ration of 3 : 1?

1. $AaBb\times AaBb$
2. $aabb\times AABb$
3. $Aabb\times Aabb$
4. $AaBb\times aabb$

Q. In a dihybrid cross, 4000 offsprings are produced in the F${}_2$ generation. How many offspring will approximately be phenotypically different from the parental generation? Assume that the parents are pureline for the contrasting traits of two characters, that is, seed shape and seed color.

1. 2500
2. 1500
3. 1000
4. 750

Q.

Three reasons for ignorance of mendel's work until 1990

Q. The genes, which remain confined to differential region of Y – chromosome, are
1) autosomal genes
2) holandric genes
3) completely sex – linked genes
4) mutant genes

Q. Mendel studied 7 pea- plant characters. Why was he unable to spot linkage in any of the genes?

1. The genes were located on 7 different chromosomes
2. The genes were located sufficiently far apart on the chromosomes
3. Pea plant doesn’t have any linkage group
4. Mendelian traits are discrete

Q. Assuming that the parents are pureline for the contrasting characters, offsprings with non-parental phenotypes in F2 generation of dihybrid cross show

1. none of these
2. dominant trait for one character and recessive for the other
3. dominant traits for both characters
4. recessive traits for both characters

Q. The crossing of $F_1$ hybrid to one of its parents is known as _________.

1. both a and b
2. back cross
3. reciprocal cross
4. test cross

Q. What will you get in the$F_1$ and $F_2$ generations in the following cross ?
Pure tall pea plant x Pure dwarf pea plant

Q. A student tried to conduct a cross in which he dusted the pollen from the tall plant on the stigma of a dwarf plant. Later in another cross, he transferred the pollen from the dwarf plant to the stigma of the tall plant.
This type of cross is known as:

1. back cross
2. test cross
3. both b and c
4. reciprocal cross

Q. Mendel's work was rediscovered in

1. 1756
2. 1900
3. 1865
4. 1910

Q.

What is a hypothesis????A possible answer to explanation of a question or not.

Q. Mendel's laws were rediscovered by

1. Lamarck, de Vries and Correns
2. Hugo de Vries, Correns and Tschermak
3. Morgan, Beadle and Tatum
4. Hugo de Vries, Morgan and Correns

Q. Multiple alleles are present

1. At different loci on the same chromosomes
2. At the same locus of the chromosomes
3. On different chromosomes
4. On non sister chromatids

Q.

Mendel’s laws were rediscovered by

1. Sutton and Boveri

2. T.H. Morgan and Bridges

3. Hugo de Vries, Carl Correns and Erich Von Tschermak

4. Waldeyer and Hofmeister

Q. In a dihybrid cross, 4000 offsprings are produced in the F${}_2$ generation. How many offspring will approximately be phenotypically different from the parental generation? Assume that the parents are pureline for the contrasting traits of two characters, that is, seed shape and seed color.

1. 2500
2. 1500
3. 1000
4. 750

Q. Which of the following scientists rediscover Mendel's work?

1. Correns, Bateson, Tschermak
2. Correns, De vries, Tschermak
3. De vries, Morgan, Tschermak
4. Correns, Tschermak, Garrod

Q. Who amongst the following scientists rediscovered Mendel's work?

1. T.H. Morgan
2. W. Bateson
3. E.Strasburger
4. Von Tschermak

Q. In a dihybrid cross, 4000 offsprings are produced in the F${}_2$ generation. How many offspring will approximately be phenotypically different from the parental generation? Assume that the parents are pureline for the contrasting traits of two characters, that is, seed shape and seed color.

1. 2500
2. 1500
3. 1000
4. 750

Q. Write a note on Neomendelism?

Q.

Mendel’s laws were rediscovered by

1. Sutton and Boveri

2. T.H. Morgan and Bridges

3. Waldeyer and Hofmeister

4. Hugo de Vries, Carl Correns and Erich Von Tschermak

Q. Employment of hereditary principles in the improvement of human race is

1. Eugenics
2. Euphenics
3. Euthenics
4. Ethnology

Q. A homozygous tall plant (T) bearing red coloured (R) flowers is crossed with a homozygous dwarf plant (t) bearing white flowers (r)

(ii) Give the possible combinations of the gametes that can be obtained from the $F_1$-hybrid.

Q. Name the scientist who converted Mendel's conclusions into principles of heredity

1. De Vries
2. Tschermak-seysenegg
3. Carl Correns
4. T. H. Morgan

Q. Carl Correns, a rediscoverer of Mendel's work, was

1. Austrian
2. Spanish
3. American
4. German

Q. Mendel's work was got republished in 'Flora' by

1. De Vries
2. All the above.
3. Tschermak
4. Correns

Q. The offspring of two creeper chicken are

1. All creepers
2. Creepers and normal in the ratio of 2 : 1.
3. Creepers and normal in the ratio of 3 : 1
4. Both homozygous and heterozygous creepers