What is the chromosome basis of inheritance in Chapter 15?
Chapter 15 – The Chromosomal Basis of Inheritance. As a consequence of nondisjunction, one gamete receives two of the same type of chromosome, and another gamete receives no copy. Offspring resulting from fertilization of a normal gamete with one produced by nondisjunction will have an abnormal chromosome number,…
What is chromosome theory of inheritance in biology?
According to the chromosome theory of inheritance, Mendelian genes have specific loci (positions) along chromosomes, and it is the chromosomes that undergo segregation and independent assortment, accounting for inheritance patterns. 2. Explain the law of segregation.
What is the basis of Mendelian inheritance?
1) Mendelian Inheritance has its physical basis in the behavior of chromosomes during sexual life-cycle. 2) Morgan traced a gene to a specific chromosome.
What is the law of segregation and independent assortment of chromosomes?
Chromosomes undergo segregation and independent assortment. Explain the law of segregation. The law of segregation states that chromosomes are equally separated between haploid gametes. Explain the law of independent assortment. The inheritance of one trait has nothing to do, is independent from, the inheritance of another trait.
What is the difference between X chromosome and Y chromosome?
Inheritance of X-Linked Genes • X chromosome have genes for many characters unrelated to sex, whereas the Y chromosome mainly encodes genes related to sex determination© 2011 Pearson Education, Inc. 18.
How many phenotypes can be produced from one gene cross?
Neither gene is on a sex chromosome. Morgan crossed F1 heterozygous females (b+bvg+vg) with homozygous recessive males (bbvgvg). According to independent assortment, this should produce 4 phenotypes in a 1:1:1:1 ratio.
What is the relationship between chromosomes chromosomes and genes?
Chromosomes and genes are both present in pairs in diploid cells. Homologous chromosomes separate and alleles segregate during meiosis. Fertilization restores the paired condition for both chromosomes and genes. Genes occupy specific loci on chromosomes. Chromosomes undergo segregation during meiosis.