Sex Determination Based on Chromosomes
The sex of a child is determined by the specific pair of sex chromosomes inherited from the parents.
Humans have 23 pairs of chromosomes, with one pair being the sex chromosomes.
- Females typically have two X chromosomes ($XX$).
- Males typically have one X chromosome and one Y chromosome ($XY$).
Chromosome Inheritance for Girl Child
During reproduction:
- The mother always contributes an $X$ chromosome from her egg cell.
- The father contributes either an $X$ or a $Y$ chromosome through his sperm.
The combination of chromosomes determines the child's sex:
- If the sperm carries an $X$ chromosome, it fertilizes the egg to form an $XX$ pair. This results in the birth of a girl child.
- If the sperm carries a $Y$ chromosome, it fertilizes the egg to form an $XY$ pair. This results in the birth of a boy child.
Therefore, the $XX$ set of chromosomes leads to the birth of a girl child.
Similar Questions
- Which of the following options best represents the predictions of a Punnett square?
- Which of the following sets of chromosomes lead to the birth of a girl child?
- ________ organs are those organs which have the same basic structural design and origin but have different functions.
- Which one of the following factors does NOT contribute to speciation (when new species develop from the existing ones)?
- Which of the following does NOT come under Gregor Mendel's Law of Inheritance?
- Sexually reproducing individuals have ________ copies of genes of the same trait.
- Who coined the phrase 'Survival of the fittest'?
- The laws of inheritance were discovered by:
- The approach based on the idea that 'organisms which are more distantly related will accumulate a greater number of differences in their DNA' is called?
- The human species have genetic roots in:
Important Questions from Genetics and Evolution
Different varieties of the same gene are called
In a sexually reproducing organism, which one of the following statements is appropriate both for the parent and offspring?
In most prokaryotes, the chromosome number is:
Bacterial DNA is referred to as naked because it is not associated with:
The two important features of sexual reproduction in higher organisms that create genetic diversity in offspring are
