According to Mendel's principle of segregation, ______?

A. more gametes carrying the dominant allele are produced than gametes carrying the recessive allele





B. gametes have one copy of each allele





C. homologous chromosomes move to the same gamete





D. gametes are diploid





E. each pair of alleles segregates into gametes





Marfan's syndrome is the result of inheriting a single allele. Individuals with Marfan's syndrome are tall and long-limbed, and have both cardiovascular and eye defects. The inheritance of Marfan's syndrome is an example of ______.





gene linkage


incomplete dominance


a recessive disorder


pleiotropy


codominance

According to Mendel's principle of segregation, ______?
According to the principle of segregation, alleles pass from the parent to the offspring, but only one of the possible alleles passes, thus the alleles are segregated. So, answer A is nonsensical according to Mendel's other principle (independent assortment) which means that each allele has equal chance of being represented in the gamete, so this means that dominant and recessive alleles should produce the same number of gametes. Answer B is also nonsensical since gametes have one copy of one allele, not one copy of each allele. Answer C is wrong based on what you know about meiosis (homologous chromosomes are separated into different gametes), and is wrong because it has nothing to do with the principle of segregation. Answer D is wrong because as you know, meiosis produces haploid (not diploid)(cells). Answer E therefore is the only one left and is the correct description of the principle of segregation.





In the question about Marfan's, since the gene is inherited as a single allele, it can't be a recessive disorder. It is possible that in Marfan's, there may be gene linkage, incomplete dominance and possibly codominance. However, the question isn't asking that and it gives you the clue as to what the question is asking by giving you several phenotypic effects of the inheritance of a single allele (which is the definition of pleiotropy).
Reply:E.
Reply:Yeah......its what N.E.said......

survey monkey