Sex Determination in Humans
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It is phase where there's synthesis of DNA
The cells makes additional energy during this phase
It is a gap phase during which the cell rests before Meiosis II begins.
Is often absent since Meiosis II begins right after Meiosis I.
Explain mechanisms of sex determination in human being.
The human body has 23 pairs of chromosomes, out of which 22 pairs are autosomes and 1 pair is sex chromosome.
Sex chromosomes
Autosomes
How is the sex of the child determined in human beings?
- fertilisation
- mitosis
- meiosis
- variation
Why are the chances of an offspring being male or female always 50:50?
The movement of sperm is random.
Equal number of X and Y bearing sperms are released.
The egg has no particular affinity towards a X bearing sperm or a Y bearing sperm
None of the above
The sperms bearing X chromosomes move faster than the sperms bearing Y chromosomes.
True
False
- Sexual reproduction
- Mitosis
- Growth
- DNA as the genetic material
The sperms bearing X chromosome reach the egg faster than the sperms bearing Y chromosome.
False
True
What are the four sub-stages of meiosis-I?
In human beings, sex of an individual is determined:
During the initial stages of pregnancy
At the time of fertilization
During the later stages of pregnancy
By the environmental factors
The sex chromosomes of a male human being are______
XX
XY
XXX
XXY
In humans, female will have ___ and male will have _____.
XX - XY
XX - XO
ZO - ZZ
ZW – ZZ
Question 16
A trait in an organism is influenced by
(a) paternal DNA only
(b) maternal DNA only
(c) both maternal and paternal DNA
(d) neither by paternal nor by maternal DNA
What is the source of genetic variations in human beings?
- Sexual reproduction
- Meiosis
- Growth
- Mitosis
Give two examples of hereditary traits.
- False
- True
- True
- False
Gametes are produced by parents contains ……………. allele for a trait.
two
one
three
four
Give two examples of hereditary traits.
एक से अधिक उत्तर प्रकार के प्रश्न
• It changes the hormonal balance of the body.
• यह शरीर के हॉर्मोन संतुलन को परिवर्तित करती है।
• It can cause side-effects too.
• इसके कुछ विपरीत प्रभाव भी हो सकते हैं।
Select the correct statement w.r.t. the contraceptive method whose information is given above.
गर्भनिरोधी विधि जिसकी सूचना ऊपर दी गई है, के संदर्भ में सही कथन का चयन कीजिए।
- It blocks the fallopian tube in females
यह स्त्री की फेलोपियन नलिका को अवरूद्ध करती है - It is commonly taken orally as pills
यह सामान्यतः मुख से गोली के रूप में ली जाती है - It is placed in the uterus to prevent pregnancy
गर्भधारण रोकने के लिए इसे गर्भाशय में स्थापित किया जाता है - It prevents pregnancy
यह गर्भधारण को रोकती है
Males in animals always possess two distinct sex chromosomes, while females have the same sex chromosomes. Which of the following disproves this statement?
There are many animals that have XO type of sex determination.
All of the above
In birds, males have the same type of sex chromosome, while females have a distinctive pair.
Eggs can never possess the Y chromosome.
Give two examples of hereditary traits.
Choose the correct option regarding the two given statements.
Statement 1: Half of the genetic information in a child comes from father.
Statement 2: Environment does not affect the observable characteristics or traits of a person at all.
- Both statement 1 and 2 are correct
- Only statement 2 is correct
- Both statement 1 and 2 are incorrect
- Only statement 1 is correct
- True
- False
Skin cells are continuously replaced by the process of
Mitosis
Meiosis
- W
- X
- Y
- Z
