Q. 115.0( 6 Votes )

A woman has only daughters. Analyse the situation genetically and provide a suitable explanation.

Answer :

The two chromosomes that determine the sex of the unborn baby are called sex chromosomes named X chromosomes and Y chromosomes. A female has two X chromosomes, while a male has one X and one Y chromosome. The gametes (egg and sperm) have only one set of chromosomes. Thus, in females all the egg cells contain X chromosomes while in males, half sperm have X chromosomes and half sperms have Y chromosomes.


When a sperm containing X chromosome fertilizes the egg, the zygote would have XX chromosomes and develop into a female child. If the sperm contributes a Y chromosome to the egg (ovum) at fertilization, the zygote would develop into a male child.


Only daughters indicate the fusion of egg with sperms carrying 22+X chromosomes every time.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Introduction to Genetic TermsIntroduction to Genetic TermsIntroduction to Genetic Terms46 mins
NCERT | Heredity and Evolution (Part-1)NCERT | Heredity and Evolution (Part-1)NCERT | Heredity and Evolution (Part-1)37 mins
Learn Some Basic Concepts of HeredityLearn Some Basic Concepts of HeredityLearn Some Basic Concepts of Heredity50 mins
Quiz | Let's Check Our Understanding on HeredityQuiz | Let's Check Our Understanding on HeredityQuiz | Let's Check Our Understanding on Heredity36 mins
Smart Revision | Some Basic Terms of HereditySmart Revision | Some Basic Terms of HereditySmart Revision | Some Basic Terms of Heredity52 mins
Smart Revision | Mendelian GeneticsSmart Revision | Mendelian GeneticsSmart Revision | Mendelian Genetics47 mins
Smart Revision | HereditySmart Revision | HereditySmart Revision | Heredity60 mins
Evolution of HumansEvolution of HumansEvolution of Humans9 mins
Interactive Quiz: Interesting facts on evolution of GeometryInteractive Quiz: Interesting facts on evolution of GeometryInteractive Quiz: Interesting facts on evolution of Geometry42 mins
Idioms and PhrasesIdioms and PhrasesIdioms and Phrases43 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :