Class 12 Biology - Chapter Principles of Inheritance and Variation NCERT Solutions | A diploid organism is heterozygous for 4
A diploid organism is heterozygous for 4 loci, how many types of gametes can be produced?
Locus is a fixed position on a chromosome, which is occupied by a single or more genes. Heterozygous organisms contain different alleles for an allelic pair. Hence, a diploid organism, which is heterozygous at four loci, will have four different contrasting characters at four different loci.
For example, if an organism is heterozygous at four loci with four characters, say Aa, Bb, Cc, Dd, then during meiosis, it will segregate to form 8 separate gametes.
If the genes are not linked, then the diploid organism will produce 16 different gametes. However, if the genes are linked, the gametes will reduce their number as the genes might be linked and the linked genes will be inherited together during the process of meiosis.
More Questions From Class 12 Biology - Chapter Principles of Inheritance and Variation
- Q:- Explain the Law of Dominance using a monohybrid cross.
- Q:- A child has blood group O. If the father has blood group A and mother blood group B, work out the genotypes of the parents and the possible genotypes of the other offsprings.
- Q:-
Explain the following terms with example
(a) Co-dominance
(b) Incomplete dominance - Q:- Define and design a test − cross?
- Q:- When a cross in made between tall plants with yellow seeds (Ttyy) and tall plant with green seed (Ttyy), what proportions of phenotype in the offspring could be expected to be (a) Tall and green. (b) Dwarf and green.
- Q:- Briefly mention the contribution of T.H. Morgan in genetics.
- Q:- Mention any two autosomal genetic disorders with their symptoms.
- Q:- What is point mutation? Give one example.
- Q:- Differentiate between the following −
(a) Dominance and Recessive
(b) Homozygous and Heterozygous
(c) Monohybrid and Dihybrid. - Q:- Using a Punnett square, work out the distribution of phenotypic features in the first filial generation after a cross between a homozygous female and a heterozygous male for a single locus.
Popular Questions of Class 12 Biology
- Q:- Why is reproduction essential for organisms? Answer
- Q:- Name the parts of an angiosperm flower in which development of male and female gametophyte take place.
- Q:-
Fill in the blanks:
(a) Humans reproduce __________. (asexually/sexually)
(b) Humans are__________. (oviparous/viviparous/ovoviviparous)
(c) Fertilization is __________ in humans. (external/internal)
(d) Male and female gametes are __________. (diploid/haploid)
(e) Zygote is __________. (diploid/haploid)
(f) The process of release of the ovum from a mature follicle is called__________.
(g) Ovulation is induced by a hormone called the __________.
(h) The fusion of male and female gametes is called _____________.
(i) Fertilisation takes place in _____________.
(j) Zygote divides to form _____________which is implanted in uterus.
(k) The structure which provides vascular connection between fetus and uterus is called ____________. - Q:- What do you think is the significance of reproductive health in a society?
- Q:- Group the following as nitrogenous bases and nucleosides:
Adenine, Cytidine, Thymine, Guanosine, Uracil and Cytosine. - Q:- Explain antibiotic resistance observed in bacteria in light of Darwinian selection theory.
- Q:- What are the various public health measures, which you would suggest as safeguard against infectious diseases?
- Q:- Explain in brief the role of animal husbandry in human welfare.
- Q:- Bacteria cannot be seen with the naked eyes, but these can be seen with the help of a microscope. If you have to carry a sample from your home to your biology laboratory to demonstrate the presence of microbes under a microscope, which sample would you carry and why?
- Q:- Can you list 10 recombinant proteins which are used in medical practice? Find out where they are used as therapeutics (use the internet).
Recently Viewed Questions of Class 12 Biology
- Q:- Amniocentesis for sex determination is banned in our country. Is this ban necessary? Comment.
- Q:- Explain what is meant by metastasis.
- Q:- Describe the post-fertilization changes in a flower.
- Q:- Draw a well-labelled diagram of an antibody molecule.
- Q:- What is primary productivity? Give brief description of factors that affect primary productivity.
- Q:- Can we call human evolution as adaptive radiation?
- Q:- Which part of the plant is best suited for making virus-free plants and why?
- Q:- What are chasmogamous flowers? Can cross-pollination occur in cleistogamous flowers? Give reasons for your answer.
- Q:- What is vegetative propagation? Give two suitable examples.
- Q:- Can you list 10 recombinant proteins which are used in medical practice? Find out where they are used as therapeutics (use the internet).
9 Comment(s) on this Question
Thanks for help!!!
Formula for calculating no. of gametes is 2 to the power n, where n is no of the genes. Here heterozygous for four loci means, four diff genes as alleles for a gene are present on same locus on the homologois pair. So the answer is 2^4=16
I can't understand
I can't understand
Plz ask me how many types of gametes can be produced ??
So answer is 8 or 16? If 16 please explain I didnât understand
formula is 2^n.where n=no. of loci .therefore,2^4=16 types of gametes
If a diploid organism is homozygous for two loci then the gametes formed will be say A B C D respectively.Since it\'s a diploid organism the number of gametes will be 2Ãn. Therefore the number of gametes will be 2Ã4=8
I have a question ... If rwo loici are homozygous. .. thn vot will be the no. Of gametes produced...
- All Chapters Of Class 12 Biology
- All Subjects Of Class 12