Biology 1001A Lecture Notes - Centromere, Metaphase, Zygote

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blushfish701

5 Jul 2014

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Division (chromosome # is reduced from diploid to haploid (n): anaphase ii reduces c value (cells divide to give products w/ 1*c amount of dna) So result = cells that are haploid and 1c. Products of meiosis in animals vs. plants, fungi and algae. In animals: diploid life cycle: multicellular, haploid phase: unicellular, use meiosis to make gametes (no other life forms do, 4 sperm, 1 ooctye, diploid phase dominates life cycle. Other fungi/algae: haploid life cycle, diploid phase: unicellular, haploid phase: multicellular, after fertilization, diploid zygote undergoes meiosis immediately (doesn"t make a. Body) produces haploid spore mitosis create gametophyte mitosis create gametes: mitosis occurs only in haploid phase, fertilization: 2 haploid gametes fuse to form diploid nucleus. In female mammals: oocytes are stuck in meiotic arrest, sexual recombination has already occurred before birth (in utero) In males: constantly sexually recombining after reaching sexual maturity. Mitosis: produces 4 daughter cells, produces 2 daughter cells, genetically different, genetically identical.

Related Questions

Which of the following statements is true?

Question 7 options:

	In plants, gametes are produced by meiosis
	In animals, gametes are produced by mitosis
	Plants have both a multicellular diploid stage and a multicellular haploid stage
	Most fungi have a life cycle that includes a multicellular diploid stage.
	Most animals have a sexual life cycle that includes a multicellular haploid stage.

skyhamster121

1. _____ _____________produces gametes in plants; ____________________produces gametes in animals

A) mitosis / meiosis

B) mitosis / mitosis

C) meiosis / meiosis

D) meiosis / mitosis

E) love, true love produces all gametes

2. _____ The end product of oogenesis is ______ functional egg(s) that is (are) ______.

A) one / haploid

B) four / haploid

C) one / diploid

D) two / diploid

E) four / diploid

3. _____ The end product of spermatogenesis is four functional sperm cells that each contain how many copies of each autosomal gene?

A) one

B) two

C) three

D) four

E) one for each dominant gene, two for each recessive gene

1) What is the event that marks the transition from haploid to the diploid stage of the life cycle and what event marks the transition back to the haploid stage again. Describe the timing of these two cellular even in life cycles that are dominated by haploid cells, dominated by diploid cells or that have alternation of generations.

2) What are the closest relatives of land plants? How do you know this? What do these relatives tell us about the ancestors of green plants -- where did they live? How big were they?

3) Why was it the green algae that gave rise to land plants -- why donât we have relatives of red or brown algae living on land?

blackcod740

Biology 1001A Lecture Notes - Centromere, Metaphase, Zygote

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