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Heritability
The statistic that indicates the extent to which variation of a certain trait can be traced to genes.
Mutation
A change in the DNA sequence of an organism's genome, which can lead to genetic variation and sometimes result in observable changes in the organism.
Zygote
The initial cell formed when a sperm cell fertilizes an egg cell, marking the beginning of pregnancy.
Chromosomes
Chromosomes are thread-like structures located within the nucleus of animal and plant cells, made of protein and a single molecule of deoxyribonucleic acid (DNA), carrying genetic information.
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