Crossing over occurs during prophase of mitosis prophase I of meiosis prophase I
ID: 82351 • Letter: C
Question
Crossing over occurs during prophase of mitosis prophase I of meiosis prophase II of meiosis metaphase I of meiosis metaphase II of meiosis All of the following are characteristics of meiosis EXCEPT involves two divisions reduces the number of chromosomes results in genetically identical cells produces haploid cells occurs in the ovaries and testes Consider an organism whose karyotype shows it to have a total of 60 chromosomes. How many chromosomes would be contained in the sperm of this organism? 23 30 46 60 90 During which stage of meiosis do the homologous chromosomes separate? prophase I metaphase II anaphase II prophase II anaphase I Occasionally, chromosomes fail to separate during meiosis, leading to daughter cells that have an abnormal number of chromosomes. This phenomenon is called Epistasis. nondisjunction. crossing over. pleiotropy. chromosome inactivation. What is the function of reverse transcriptase in retroviruses? it uses viral RNA as a template for DNA synthesis. it converts host cell RNA into viral DNA. it uses viral RNA as a template for making complementary RNA strands. it translates viral RNA into proteins. It uses viral DNA to make complementary RNA.Explanation / Answer
18. ANS: B. prophase I of meiosis
Crossing over occurs during prophase I phase of meiosis.
19. ANS: c. Results in genetically identical cells
During the meiosis, the number of chromosomes halves, some gametes take some of the genetic characteristics and some get the other half, there for they are genetically DIFFERENT.
20. ANS: B. 30
An organism with karyotype shows it to have a total of 60 chromosomes. Then the sperm of that organism can contain 30 chromosomes.
21. ANS: E. Anaphase I
Meiosis I have homologous chromosomes pairing in Prophase I, tetrads at the equator in Metaphase I, and homologous chromosomes separate in Anaphase I
22. ANS: B. non-disjunction
If the chromosomes fail to separate during meiosis I as a result of crossing over the cells produced will either lack 1 chromosome or have an extra chromosome. This is called non-disjunction and results in the following conditions
23. ANS: A. It uses viral RNA as a template for DNA synthesis.
In retroviruses reverse transcriptase uses viral RNA as a template for DNA synthesis.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.