Zygosity in genetics is the degree of similarity between alleles at a gene locus, influencing traits and inheritance. It includes homozygosity, heterozygosity, hemizygosity, nullizygosity, autozygosity, and allozygosity. These concepts are pivotal in understanding genetic diversity, diseases, and twin studies, offering insights into genetic inheritance and the role of environmental factors.
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1
Meaning of homozygous
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2
Meaning of heterozygous
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3
Difference between hemizygous and nullizygous
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4
Most genes possess ______ alleles, enhancing variation.
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5
The frequency of alleles within a population can be ______ or rare.
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6
Certain alleles might be linked to ______ disorders.
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7
An individual's ______ and genetic makeup are determined by how alleles are inherited.
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8
The survival and ______ of species depend on genetic diversity.
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9
Definition of Homozygosity
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10
Significance of Homozygous-Dominant
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11
Role of Homozygosity in Progeny
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Determines trait inheritance and expression in offspring.
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In genetics, ______ refers to the presence of two distinct alleles at the same gene position.
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Heterozygosity
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A heterozygous genotype is represented by one ______ (dominant) and one ______ (recessive) letter, like 'Aa'.
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uppercase lowercase
14
Individuals with heterozygous genes usually express the ______ trait but also have the ______ allele.
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dominant recessive
15
The phenomenon where heterozygosity leads to greater ______ fitness compared to homozygous forms is known as ______ advantage.
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biological heterozygote
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Definition of Hemizygosity
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Presence of a single allele at a gene locus in a diploid organism, due to gene deletion or sex chromosome genes.
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Hemizygosity in Human Males
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Hemizygosity vs Autosomal Gene Inheritance
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19
______ refers to the condition where both alleles at a gene locus are nonfunctional, leading to no gene expression.
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20
Meaning of autozygosity
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21
Meaning of allozygosity
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22
Autozygous genotypes vs. allozygous genotypes
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23
______ twins come from one zygote that splits, resulting in genetically identical offspring.
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24
______ twins are born when two separate eggs are fertilized by two distinct sperm, leading to genetically distinct siblings.
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25
______ twins are a rare type, formed when two sperm fertilize a single egg which then divides.
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Biology
Exploring Zygosity: Definition and Clinical Relevance
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