Non-Mendelian Inheritance I FULL VIDEO скачать в хорошем качестве

Non-Mendelian Inheritance I FULL VIDEO

Join this channel to get access to perks:    / @joedelyncruz   Non-Mendelian Inheritance I FULL VIDEO Non-Mendelian Inheritance refers to genetic patterns that go beyond Mendel’s basic dominant-recessive rules. These inheritance patterns are influenced by various factors, including multiple alleles, incomplete dominance, codominance, and the roles of hormones. • Incomplete Dominance: Traits blend together, resulting in an intermediate phenotype, like crossing a red and white flower to get a pink one. Example: Four O'clock plants. • Codominance: Both alleles are equally expressed in the heterozygote, such as when red and white cows produce a spotted offspring, with both red and white colors visible. • Multiple Alleles: Some traits are influenced by more than two alleles within a population. A prime example is the ABO blood type system in humans, where alleles A, B, and O combine in different ways to produce the four blood types (A, B, AB, and O). • Sex-Linked Genes: These are genes located on the X or Y chromosomes. For example, color blindness is , making it more common in males due to their single X chromosome. Another example is X-linked Hypertrichosis Pinnae Auris, a Y-linked trait causing excessive hair growth on the outer ear, seen only in males. • Sex-Limited Traits: Traits that are expressed in only one sex, despite both sexes carrying the genes. These traits are often regulated by hormonal differences. An example is lactation in cattle, which is dominant in females but never expressed in males due to hormonal differences. Other examples include Adam’s apple in males and menstruation in females. • Sex-Influenced Traits: These traits are expressed in both sexes but are more common in one sex due to hormonal influence. Baldness is a key example, where it is dominant in males but recessive in females, making baldness more common in men. Other examples include aggression in males and breast cancer susceptibility in females.