Question

the first 2 are from a crossword puzzle, i included # of boxes

1) The place where homologous chromosomes are held together and swap DNA in the tetrad during crossing over -------------. (9 boxes)

2) The phase of the cell cycle where DNA is replicated---------. (14 boxes)

3) Human blood types are an example of what form of inheritance ?

4) Define convergent evolution.

5) Define evolution.

Give a plausible explanation for how lizards with 4 legs evolved into snakes with no legs. What forces are involved? How do these forces work? Be clear and concise in your answer. You may not be right based on current data but if you apply the concepts of this unit properly and give a logical argument, you can still get credit.

Answer 1

Question 1 Answer: Prophase I Explanation : In meiosis cell division crossing over of homologous chromosomes occur. At the end of 'Prophase I' sister chromatid of homologous chromosome held together at the chiasmata and this Form called tetrads. In this time crossing over occur. guestion 2 Answer i Synthesis Phase Explanation : s phase on synathesis phase is a part of inter phase occurring between Gex phase and bez phase. In this phase DNA is replicated

non-mendelian guestion 3 Answer: Multiple alleles Explanation : Multiple alleles is a inheritance pattern. In multiple more than two allelic forms of glene is present. only two of which can exist in normal diploid any individuale ABO blood group of humans is Controlled by a single gene which has three allelic forms IA, IB, I°. guestion 4 Answer: species from different. evolutionary branches may resemble each other if they have simillare ecological roles. This type evolution called con vergent evolution guestion 6 Answer: Evolution is a process in which species change over time. Ancient organisms are evolve over million and mordern organisms come. of years