THE MOLECULAR BASIS OF INHERITANCE
GENE MUTATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A child’s genes come from the mother only as her genes are copied and passed down.
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A child’s genes come from the father only as his genes are copied and passed down.
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A child’s genes come from both parents as he inherits copied genes from the mother and the father.
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A child’s genes come from one chromosome in the body.
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Detailed explanation-1: -One copy is inherited from their mother (via the egg) and the other from their father (via the sperm). A sperm and an egg each contain one set of 23 chromosomes. When the sperm fertilises the egg, two copies of each chromosome are present (and therefore two copies of each gene), and so an embryo forms.
Detailed explanation-2: -Autosomal dominant traits pass from one parent onto their child. Autosomal recessive traits pass from both parents onto their child. Autosomal refers to the 22 numbered chromosomes as opposed to the sex chromosomes (X and Y).
Detailed explanation-3: -Genetically, you actually carry more of your mother’s genes than your father’s. That’s because of little organelles that live within your cells, the mitochondria, which you only receive from your mother.
Detailed explanation-4: -Homologous chromosomes or homologs are a pair of two chromosomes with the same length, centromere position, and staining pattern in a karyotype.