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The fertilized egg, or zygote, contains chromosomes that direct the development of the baby’s sex. Females carry two X chromosomes while males carry one X and one Y chromosome. The type of sperm that fertilizes the egg is crucial in determining the baby’s sex.
In humans, sex determination is governed by chromosomes found in cells, particularly the sex chromosomes, X and Y. Every human has 23 pairs of chromosomes, including one pair that determines sex. Females possess two X chromosomes (XX), while males have one X and one Y chromosome (XY). During fertilization, the unfertilized egg always carries one X chromosome. Sperm can carry either an X or a Y chromosome. If sperm with an X chromosome fertilizes the egg, the resulting zygote is female (XX). If sperm with a Y chromosome fertilizes the egg, the zygote is male (XY). Therefore, the father’s sperm chromosome determines the sex of the offspring, debunking the myth that the mother influences this outcome.
Sex chromosomes: X and Y chromosomes determining sex.
Zygote: The fertilized egg that develops into a baby.
Fertilization process: How sperm and egg combine to decide sex.
Myth debunking: Realizing the father's role in sex determination.
X marks the girl, Y’s for the boy, choose your sperm wisely to find your joy.
Once upon a time, two brave sperm from different kingdoms raced to meet a waiting egg; one brought an 'X' and the other a 'Y'. The fate of the new baby depended on their journey.
X = girl, Y = boy: Just remember who brings the toy (chromosome) to the party (fertilization)!
Example 1: If a sperm carrying an X chromosome fertilizes an egg, the baby becomes female (XX).
Example 2: If a sperm carrying a Y chromosome fertilizes the egg, the baby develops as male (XY).
Term: Chromosomes
Definition: Thread-like structures found in the nucleus of cells that carry genetic information.
Thread-like structures found in the nucleus of cells that carry genetic information.
Term: Zygote
Definition: The fertilized egg that develops into a baby.
The fertilized egg that develops into a baby.
Term: X Chromosome
Definition: One of the two types of sex chromosomes, present in females in pairs (XX).
One of the two types of sex chromosomes, present in females in pairs (XX).
Term: Y Chromosome
Definition: The other type of sex chromosome, present in males (XY).
The other type of sex chromosome, present in males (XY).
Term: Fertilization
Definition: The process where sperm meets an egg and forms a zygote.
The process where sperm meets an egg and forms a zygote.
Term: Sex Determination
Definition: The biological mechanism that determines whether a baby will be male or female.
The biological mechanism that determines whether a baby will be male or female.