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प्रश्न
Distinguish between heterogametic and homogametic sex determination systems.
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उत्तर
| Heterogametic Sex | Homogametic Sex |
|
1. Organisms producing two different types of gametes. |
1. Organisms producing only one type of gametes. |
|
2. Example: Human male. |
2. Example: Human female. |
संबंधित प्रश्न
Choose the correct answer:
Males have more chances of suffering from sex-linked disease because of ___________
Kavitha gave birth to a female baby. Her family members say that she can give birth to only female babies because of her family history. Is the statement given by her family members true? Justify your answer.
Match the items of Column I with Column II:
| Column I | Column II | ||
| i. | XX-XO method of Sex Determination | a. | Turner syndrome |
| ii. | XX-XY method of Sex Determination | b. | Female heterog ametic |
| iii. | karyotype-45 | c. | Grasshopper |
| iv. | ZW-ZZ method of Sex Determination | d. | Female homogametic |
Which of the following organisms has haploid number of chromosomes?
Which of the following is an example of genetic variation?
Select the incorrect statement
A trait in an organism is influenced by
Some dinosaurs had feathers although they could not fly but birds have feathers that help them to fly. In the context of evolution this means that
In humans, males are heterogametic and females are homogametic. Explain. Are there any examples where males are homogametic and females heterogametic?
Sex of an individual is determined by different factors in various species. Some animals rely entirely on the environmental ones, while in some other animals the individuals can change their sex during their life time indicating that sex of some species is not genetically determined. However in human beings, the sex of an individual is largely determined genetically.
- In what way are the sex chromosomes 'X' and 'Y' different in size? Name the mismatched pair of sex chromosome in humans.
- Write the number of pair/pairs of sex chromosomes present in human beings. In which one of the parent (male/female) perfect pair/pairs of sex chromosome are present?
- Citing two examples, justify the statement "Sex of an individual is not always determined genetically".
OR
Draw a flow chart to show that sex is determined genetically in human beings.
