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प्रश्न
What is parthenogenesis?
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उत्तर
The process by which a female produces offspring from unfertilized eggs is known as parthenogenesis.
संबंधित प्रश्न
If X chromosome is inherited from mother and Y from father, the offspring will be male.
Write the types of sex-determination mechanisms the following crosses show. Give an example of each type.
(i) Female XX with Male XO
(ii) Female ZW with Male ZZ
"The sex of a newborn child is a matter of chance and none of the parents may be considered responsible for it". Draw a flow chart showing determination of sex of a newborn to justify this statement.
Write notes on sex determination in the unborn baby.
In a human, how many chromosmes are present in a sperm in the testes?
The human animal which has an XY pair of chromosomes is called :
(a) male
(b) hybrid
(c) female
(d) doomed
In human males all the chromosomes are paired perfectly except one. This/these unpaired chromosomes is/are:
- large chromosome
- small chromosome
- Y chromosome
- X chromosome
The sex of a child is determined by which of the following?
Name two animals which have nineteen pairs of chromosomes.
Name any two genetic in humans.
Define the following:
Autosomes
There are five daughters and no son in a family. It is because
Which of the following is incorrect regarding ZW - ZZ type of sex determination?
A zygote which has an X-chromosome inherited from the father will develop into a ______.
Which of the following decides the sex of the child?
A woman has only daughters. Analyse the situation genetically and provide a suitable explanation.
Does a male child inherit X chromosome from his father? Justify.
All human chromosomes ate not paired. Most human chromosomes have a maternal and a paternal copy, and we have 22 such pairs. But one pair called the sex chromosomes, is odd in not always being a perfect pair. Women have a perfect pair of sex chromosomes. But men have a mismatched pair in which one is normal sized while the other is a short one.
(a) In humans, how many chromosomes are present in a Zygote and in each gamete?
(b) A few reptiles rely entirely on environmental cues for sex determination. Comment.
(c) "The sex of a child is a matter of chance and none of the parents are considered to be responsible for it." Justify it through flow chart only.
OR
(c) Why do all the gametes formed in human females have an X chromosome?
What is the probability of a girl or a boy being born into a family? Justify your answer.
