Advertisements
Advertisements
Question
A male honeybee has 16 chromosomes whereas its female has 32 chromosomes. Give one reason.
Advertisements
Solution 1
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.
Solution 2
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.
RELATED QUESTIONS
If centromere is situated in the middle of the chromosome, it is called ________.
(a) Metacentric
(b) Acrocentric
(c) Submetacentric
(d) Telocentric
How many chromosomes do drones of honey bees possess?
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.
Changing the codon AGC to AGA represents
A B B C C D E F G H I
From the above figure identify the type of mutation and explain it.
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.
Identify the term that represents the degree of repetition of the primary basic number of chromosomes in a cell.
Which of the following does NOT agree with chrotnosomal theory of inheritance?
A plant having the genotype AABbCC will produce ______ kinds of gametes.
Extra nuclear chromosomes occur in ______.
Extranuclear inheritance is a consequence of presence of genes in ______.
Two or more independent genes present on different chromosomes which determine nearly same phenotype are called ______.
Chromosomal theory of inheritance was given by ______.
A couple has two daughters. What is the probability that the third child will also be a female?
What do you mean by locus?
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
A haemophilic man marries a carrier woman and they have a daughter. What is the probability of their daughter being haemophilic?
