Class 12 Biology - Chapter Principles of Inheritance and Variation NCERT Solutions | A child has blood group O. If the father
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.
The blood group characteristic in humans is controlled by three set of alleles, namely, IA, IB, and i. The alleles, IA and IB, are equally dominant whereas allele, i, is recessive to the other alleles. The individuals with genotype,
Hence, if the father has blood group A and mother has blood group B, then the possible genotype of the parents will be
Father Mother
IA IA or IA i IB IB or IB i
A cross between homozygous parents will produce progeny with AB blood group.
A cross between heterozygous parents will produce progenies with AB blood group (IAIB) and O blood group (ii).
More Questions From Class 12 Biology - Chapter Principles of Inheritance and Variation
- Q:- Explain the Law of Dominance using a monohybrid cross.
- Q:- A diploid organism is heterozygous for 4 loci, how many types of gametes can be produced?
- 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:- What is DNA fingerprinting? Mention its application.
- Q:- Why is the offspring formed by asexual reproduction referred to as clone?
- 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.
4 Comment(s) on this Question
Thank you
thank u.......
thanks .... seriously this is the very important question .....perhaps this question is being continuously asked for about 5 yrs........
ðthank u
- All Chapters Of Class 12 Biology
- All Subjects Of Class 12