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प्रश्न
A male honeybee has 16 chromosomes whereas its female has 32 chromosomes. Give one reason.
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उत्तर १
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.
उत्तर २
A male honeybee has 16 chromosomes because it is haploid, developing from unfertilized eggs by parthenogenesis. A female honeybee has 32 chromosomes because it is diploid, developing from fertilized eggs and thus having two sets of chromosomes. This is the haplodiploid mechanism of sex determination in honeybees.
संबंधित प्रश्न
If centromere is situated in the middle of the chromosome, it is called ________.
(a) Metacentric
(b) Acrocentric
(c) Submetacentric
(d) Telocentric
What is gene pool?
Define the term ‘genome’.
Name the type of cell division involved in the production of sperms by honey bees.
Classify the chromosomes on the basis of position of centromere.
Choose the correct options of the following question:
Study the given monohybrid cross:
A test cross for this Fj will be:
An allohexaploidy contains
Identify the scientists who proposed chromosomal theory of inheritance.
Telocentric chromosome differs from acrocentric chromosome in that ____________.
Extranuclear inheritance occurs in ______.
Extra nuclear chromosomes occur in ______.
Extranuclear inheritance is a consequence of presence of genes in ______.
Mendel’s work was rediscovered by three scientists in the year ______.
Which three scientists independently rediscovered Mendel’s work?
Chromosome maps/genetic maps were first prepared by ______.
Which of the following statements indicates parallelism in genes and chromosomes?
- They occur in pairs.
- They segregate during gamete formation.
- They show linkage.
- Independent pairs segregate independently.
A couple has two daughters. What is the probability that the third child will also be a female?
What are minisatellites?
During mitosis, chromosomes distribution to the daughter cell is ______.
In a karyotype analysis, X and Y chromosomes represent sex chromosomes.
Name the scientist who discovered the X chromosome.
