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प्रश्न
उत्तर
a. There are 22 pairs of autosomes and one pair of sex chromosomes present in human beings.
b. In females 22 pairs of autosomes and XX sex chromosomes are present.
c. In males 22 pairs of autosomes and XY pair of sex chromosomes.
d. In human males, two dissimilar chromosomes are present in 23rd pair, the longer 'X' and the shorter 'Y'. In females, the 23rd pair contains two similar 'X' chromosomes. All children inherit one 'X' chromosome from their mother. The other chromosome is inherited from the father. If the chromosome inherited from the father is 'X', then the offspring is a daughter and if it is 'Y', then the offspring is a son.
Thus, the sex of the child is determined by the male sex chromosome.
APPEARS IN
संबंधित प्रश्न
Differentiate between 'ZZ' and 'XY' type of sex-determination mechanisms.
"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.
Fill in the following blank with suitable word :
The...............chromosomes for a ............are XX whereas that for a ..............are XY.
In a human, how many chromosmes are present in an egg which has just been produced by the ovary?
The human animal which has an XY pair of chromosomes is called :
(a) male
(b) hybrid
(c) female
(d) doomed
The sex of a child is determined by which of the following?
(a) the length of the mother's pregnancy
(b) the length of time between ovulation and copulation
(c) the presence of and X chromosome in an ovum
(d) the presence of a Y chromosome in a sperm
A couple with a newborn baby is troubled that the child does not resemble either of them. Suspecting that a mixup occurred at the hospital, they check the blood type of the infant. It is type O. Because the father is type A and the mother type B, they conclude that a mixup has definitely occurred. Are they correct? Give reason for your answer.
Write a short note on sex determination in man.
Short Answer Question.
“Father is responsible for determination of sex of child and not the mother”. Justify.
How many ovum are formed when a diploid cell undergoes meiosis, during oogenesis?
Read the following statements and select the correct option.
i. If sperm containing Y chromosome fertilizes the ovum, then diploid zygote is formed that grows into a male child.
ii. If sperm containing X chromosome fertilizes ovum, then diploid zygote is formed, that grows into a female child.
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 develops through parthenogene is?
Which of the following combination of chromosome numbers represents the correct sex determination pattern in honey bees?
A zygote which has an X-chromosome inherited from the father will develop into a
Select the statements that describe characteristics of genes
- genes are specific sequence of bases in a DNA molecule
- a gene does not code for proteins
- in individuals of a given species, a specific gene is located on a particular chromosome
- each chromosome has only one gene
Which pair of sex chromosome will determine a male?
A zygote which has Y chromosome inherited from the father will develop into a ______.
