Question

XX
X
2.
3.The genotype of the normale male.​

Answer 1

Answer:

The genotype of normal male is XY with X and Y chromosomes.

Answer 2

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The genotype is one X chromosome which is dominant and one Y chromosome which is recessive.

Explanation:

It depends on the parent.

⇒ If the human contributes X chromosome, the resultant baby will be a male. If a human contributes a Y chromosome, the resultant baby will be a female.

Punnet square:

• XX is human female chromosome.
• XY is human male chromosome.

$\ \quad \sf X \ \ \ \ \; \! \sf X \\ \sf X\boxed{\sf{\red{XX}}} \boxed{\sf{\red{XX}}}\\\sf Y\boxed{\sf{\red{XY}}} \boxed{\sf{\red{XY}}}$

Therefore, phenotypic ratio = 1:2.

Points to remember:

• Sex chromosomes in humans are of two types X and Y.
• Females have two X chromosomes in their cells while males have one X and one Y in their cells.
• When the sperm containing the X chromosome fertilises the egg, then the zygote develops into a female. When the sperm containing the Y chromosome fertilises the egg, then the zygote develops into a male.
• Genotype means the genetic constitution of an individual organism.