A male honeybee has 16 chromosomes whereas its female has 32 chromosomes. Give one reason. - Biology


A male honeybee has 16 chromosomes whereas its female has 32 chromosomes. Give one reason.



Male honey bees are born from unfertilised eggs, whereas female honey bees are born from fertilised eggs. Because the unfertilised egg carries half the number of chromosomes as compared to the fertilised egg, male honey bees have half the number of chromosomes as compared to female honey bees.

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2015-2016 (March) All India Set 1


If centromere is situated in the middle of the chromosome, it is called ________.

(a) Metacentric

(b) Acrocentric

(c) Submetacentric

(d) Telocentric

If the number of chromosomes in an endosperm cell is 27, what will be the chromosome number in the definitive nucleus?

  1. 9
  2. 18
  3. 27
  4. 36

Define the term ‘genome’.

How many chromosomes do drones of honey bees possess?

Distinguish between X andY chromosomes. (Mention any 'two' points.) 

Explain the types of chromosomes on the basis of position of centromere.

Name the type of cell division involved in the production of sperms by honey bees.

Describe the structure of chromosomes with a suitable diagram.

Distinguish between X and Y chromosomes.

Describe the structure of sex-chromosomes. 

Choose the correct options of the following question:

Study the given monohybrid cross:

A test cross for this Fj will be:

Define the Homologous chromosomes

Give an account of artificial chromosomes in the transfer of genetic material.

Answer the following question.
Compare in any three ways the chromosomal theory of inheritance as proposed by Sutton and Bovery with that of experimental results on pea plant presented by Mendel.

Explain codominance in colour coat in cattle with checker board method.

An allohexaploidy contains

The A and B genes are 10 cm apart on a chromosome. If an AB/ab heterozygote is test crossed to ab/ab, how many of each progeny class would you expect out of 100 total progeny?

Genes G S L H are located on the same chromosome. The recombination percentage is between L and G is 15%, S and L is 50%, H and S are 20%. The correct order of genes is

If the haploid number in a cell is 18. The double monosomic and trisomic number will be

Changing the codon AGC to AGA represents

Codon – anticodon interactions occur by


From the above figure identify the type of mutation and explain it.

Write the salient features of the Sutton and Boveri concept.

When two different genes came from the same parent they tend to remain together.

Write the observed phenotypic ratio.

If you cross dominant genotype PV/PV male Drosophila with double recessive female and obtain F1 hybrid. Now you cross F1 male with double recessive female.

What is the possible genotype in the F2 generation?

Mention the name of man-made cereal. How it is formed?

Match the column I (Type of chromosome) with column II (name of chromosome).

  Type of chromosome   Name of chromosome
i. P. Acrocentric
ii. Q. Telocentric
iii. R. Metacentric
iv. S. Sub-metacentric

Which of the following is a primary constriction?

Read the following statements regarding 'X and Y' chromosomes and select the correct option.

P - Due to presence of large amount of euchrornatin X chromosome is genetically more active.

Q - Due to presence of small amount of heterochromatin Y chromosome is genetically more active.

During cell division, spindle fibres get attached to the disc shaped structures present on the centromere are known as ______.

From the following identify the INCORRECT statement/s with respect to the chromosomes.

i. Chromosomes are capable of self replication and play vital role in heredity, mutation, variation, and evolutionary development of eukaryotic species.

ii. Chromosomes are visible during cell division.

iii. Chemically eukaryotic chromosomes are made of mRNA, histone and non-histone proteins.

iv. The number of chromosomes varies within the population of a particular species.

Identify the term that represents the degree of repetition of the primary basic number of chromosomes in a cell.

From the following identify the statements that are CORRECT with respect to homologous and non-homologous region of X and Y chromosomes.

i. Non-homologous region of X chromosome is longer and contains more genes than that of non-homologous region of Y chromosome.

ii. X-linked genes are present on nonhomologous region of X-chromosome.

iii. Y-linked genes are present on homologous region of Y-chromosome.

iv. Crossing over occurs only between homologous regions of X and Y chromosomes.

At secondary constriction I, ______ becomes organized during interphase.

Which of the following does NOT agree with chrotnosomal theory of inheritance?

Extra nuclear chromosomes occur in ______.

Extranuclear inheritance is a consequence of presence of genes in ______.

Experimental verification of ‘chromosomal theory of inheritance’ was done by ______.

Chromosome maps/genetic maps were first prepared by ______.

How many types of gametes would be produced if the genotype of a parent is AaBB?

Which of the following statements indicates parallelism in genes and chromosomes?

  1. They occur in pairs.
  2. They segregate during gamete formation.
  3. They show linkage.
  4. Independent pairs segregate independently.

What would be the genotype of the parents if the offspring have the phenotypes in 1:1 proportion?

During mitosis, chromosomes distribution to the daughter cell is ______.

What do you mean by locus?

Which of the following phase follows S and G2 phases of interphase?

Who postulated the 'Chromosomal theory of inheritance'?

Genes located on same locus but having different expressions are:

Experimental verification of the chromosomal theory of inheritance was done by ______.

Which of the following sentences are correct?

1. The offspring exhibit only parental combinations due to incomplete linkage

2. The linked genes exhibit some crossing over in complete linkage 

3. The separation of two linked genes are possible in incomplete linkage

4. Crossing over is absent in complete linkage

Which of the following is sex chromosomal disorder?

A haemophilic mari marries a carrier woman and they have a daughter. What is the probability of their daughter being haemophilic?

In a karyotype analysis, X and Y chromosomes represent sex chromosomes.

Name the scientist who discovered the X chromosome.


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