Of the 46 chromosomes in a normal human cell, how many are contributed by the mother?
Question: Of the 46 chromosomes in a normal human cell, how many are contributed by the mother?
Of the 46 chromosomes in a normal human cell, 23 are contributed by the mother.
Humans are diploid organisms, meaning that they have two copies of each chromosome. One copy comes from the mother and the other copy comes from the father. Chromosomes are thread-like structures that contain DNA, the genetic material that determines our physical characteristics and traits.
During sexual reproduction, the sperm and egg cells each contribute one set of 23 chromosomes to the zygote, the fertilized egg. This means that the zygote inherits 23 chromosomes from the mother and 23 chromosomes from the father.
One of the 23 pairs of chromosomes is the sex chromosomes, which determine a person's sex. Females have two X chromosomes, while males have one X chromosome and one Y chromosome. The sperm cell can contribute either an X chromosome or a Y chromosome to the zygote, while the egg cell can only contribute an X chromosome. If the zygote receives an X chromosome from the sperm cell, it will be a female. If the zygote receives a Y chromosome from the sperm cell, it will be a male.
The remaining 22 pairs of chromosomes are called autosomes. They do not determine a person's sex, but they do contain genes that determine other physical characteristics and traits, such as eye color, hair color, and height.
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