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Consanguineous marriages show
Increase in appearance of recessive defective traits
Marriages in blood relations
Union of gametes within same genetic ancestry
All of the above
Answers (1)
Consanguineous marriages refer to marriages between individuals who are closely related by blood, such as cousins or more distant relatives. These marriages can have several effects, including:
(1) Increase in the appearance of recessive defective traits: Consanguineous marriages increase the likelihood of offspring inheriting two copies of a recessive defective gene. When close relatives marry, they are more likely to carry similar recessive genes, which increases the chances of these genes being inherited by their offspring. If both parents carry the same recessive defective gene, their children have a higher probability of inheriting two copies of the gene, leading to the expression of a recessive genetic disorder.
(2) Marriages in blood relations: Consanguineous marriages explicitly involve the union of individuals who are closely related by blood. This can include marriages between cousins, siblings, or other blood relatives.
(3) Union of gametes within the same genetic ancestry: Consanguineous marriages involve the union of gametes (sperm and egg) from individuals who share a close genetic ancestry. This means that the genetic material being combined during reproduction is derived from a relatively limited gene pool, which can increase the chances of inheriting both desirable and undesirable genetic traits.
It is important to note that while consanguineous marriages do increase the risk of inheriting certain genetic disorders, not all offspring from such marriages will necessarily have negative health outcomes. The expression of genetic disorders depends on various factors, including the specific genetic makeup of the individuals involved and the presence of other modifying genetic or environmental factors.
Hence, the correct answer is option 4.
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