Structure of Homologous Chromosomes

Q.

Write in brief about the formation of spindle fibres in plant cells.

Q.

How many homologous pairs do humans have?

Q.

At the bivalent stage, how many chromatids will be there in a human cell?

1. 23

2. 22

3. 46

4. 92

Q.

What is a homologous gene?

Q. If you are provided with root tips of onion in your class and are asked to count the chromosome, which of the following stage can you most conveniently look into?

1. Metaphase
2. Telophase
3. Anaphase
4. Prophase

Q. Homologous chromosomes can be defined as :

1. Chromatids of same chromosome
2. Same chromosome, same gene, different allele in different order
3. Same chromosome, different gene, same allele
4. Same chromosome, same gene, different allele in same order

Q. The image given below is a chromosome. What is the structure labeled as A in the image?

1. Centromere
2. Centriole
3. Sister chromatid
4. Telomere

Q. According to the chromosomal theory of inheritance

1. chromosomes condense during anaphase of cell division
2. chromosomes align at the equator during telophase
3. chromosomes carry factors
4. genes are non-hereditary units

Q. _________ is the site of attachment of spindle fibres to sister chromatids during mitosis.

1. Centromere
2. Centriole
3. Kinetochore
4. Centrosome

Q. How many of the following statements are correct?
I. Three scientists independently rediscovered Mendel’s work.
II. Coloured bodies called lysosomes can be visualised inside the nucleus by staining cells.
III. By 1890, the chromosome movement during meiosis had been studied.
IV. Mitosis is a kind of equational division and meiosis is reductional division.
V. Chromosomes and genes occur in pairs.
VI. Two alleles of a gene are located on a homologous site on homologous chromosomes.

1. 2
2. 3
3. 5
4. 4

Q. Lampbrush chromosomes are also called diplotene chromosomes because they

1. Show chiasmata
2. All of the above
3. Resemble diplotene chromosomes
4. Are in permanent diplotene stage

Q. The term chromosome was coined by

1. W Flemming
2. W Roux
3. Waldeyer
4. Sutton

Q. What is false for synaptonemal complex?

1. Synaptonemal complex has recombination nodule
2. Synaptonemal complex starts dissolution in diplotene stage
3. Synaptonemal complex help in crossing over
4. Synaptonemal complex is a form of RNA

Q.

At the bivalent stage, how many chromatids will be there in a human cell?

1. 46

2. 23

3. 92

4. 22

Q. The term "homologous chromosomes"

1. refers to replications of the same chromosome
2. is another name for sister chromatids
3. must be haploid
4. means a pair of chromosomes of the same kind

Q. Lampbrush chromosomes occur inside

1. Nucleus of human cells
2. Ocytes of Frog/amphibian
3. Salivary glands of drosophila
4. Salivary glands of silk moth

Q. The scientist who first discovered cytoplasmic inheritance was

1. Correns
2. Rhoades
3. Mendel
4. Morgan

Q. _________ is the site of attachment of spindle fibres to sister chromatids during mitosis.

1. Centromere
2. Centriole
3. Kinetochore
4. Centrosome

Q.

How is the arrangement of centromeres in metacentric chromosomes?

Q. The image given below is a chromosome. What is the structure labeled as A in the image?

1. Centromere
2. Centriole
3. Sister chromatid
4. Telomere

Q. Genes on same chromosome can be

1. linked
2. homologous
3. autosomes
4. identical alleles

Q.

At the bivalent stage, how many chromatids will be there in a human cell?

1. 46

2. 23

3. 92

4. 22

Q. A chromosome with a very long arm and a very short arm is termed as

1. Sub-Metacentric
2. Telocentric
3. Metacentric
4. Acrocentric

Q.

Who had proposed the chromosomal theory of inheritance?

Q. Briefly mention the contribution of T.H. Morgan in genetics.

Q. Homologous chromosomes have the same

1. nucleotide sequence
2. sequence of genes
3. alleles
4. gene position

Q. The size of the linkage group depends on the size of the chromosome. If the chromosome is long enough, and the genes are located sufficiently far apart on the chromosomes, events in which of the following stages of cell division might cause the genes to be inherited independently of each other?

1. Prophase I
2. Anaphase I
3. Prophase II
4. Anaphase II

Q. Centromere is a part of

1. endoplasmic reticulum
2. ribosomes
3. mitochondria
4. chromosome

Q. The Y-chromosome can be used to trace a person's lineage many generations into the past. What characteristic of the Y-chromosome allows this to be accomplished ?

1. The Y-chromosome is extremely large.
2. The Y-chromosome engages in only a tiny bit of crossing over.
3. The Y-chromosome is carried exclusively in females.
4. All sperm cells carry the Y-chromosome.

Q. what is the meaning of parthenogenesis?