in a rose flower (angiosperm) the unfertilized egg has 18 chromosomes. later the egg is fertilized...
Homework Answers
1. In angiosperms, one sperm cell fertilizes an egg and forms an embryo and other sperm cell fuses with polar nuclei in the embryo sac and forms endosperm. This is called double fertilization. An embryo is formed when an egg (n) is fertilized by sperm (n), therefore embryo is diploid (2n). It has two sets of chromosomes.
n = one set of chromosomes = 18
number of chromosomes in embryo = 2n = 2* 18 = 36
Embryo (diploid) has 36 chromosomes
2. Endosperms are formed as a result of double fertilization in angiosperms. When sperm (n) fuses with polar nuclei (2n), the endosperm is formed. Hence endosperms in angiosperms are triploid (3n). It has 3 sets of chromosomes
number of chromosomes in endosperm = 3n = 3 * 18 = 54
Endosperm (triploid) has 54 chromosomes
3. The integument is an outer covering of an ovule. In angiosperms, there are two integuments. Integument of the ovule of angiosperm is diploid (2n). It has two sets of chromosomes.
number of chromosomes in integument = 2n = 2* 18 = 36
Integument (diploid) has 36 chromosomes
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a rose flower (angiosperm) the unfertilized egg has 18 chromosomes.
later the egg is fertilized...
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question 1 and 2
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Double fertilization in an angiosperm produces a diploid zygote and a haploid polar nucleus. a diploid zygote and a diploid endosperm. a diploid embryo and a triploid zygote. a triploid embryo and a diploid endosperm. a diploid zygote and a triploid endosperm. Which of the following is the correct order of floral organs from the outside to the complete flower? petals-sepals-stamens-carpels sepals-stamens-petals-carpels spores-gametes-zygote-embryo sepals-petals-stamens-carpels male gametophyte-female gametophyte-sepals-petals Why is sexual reproduction important? It allows animals to conserve resources and reproduce...
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question 1 and 2
Question 1: i) If a cell has eight chromosomes before meiosis, how many chromosomes will it have at metaphase I? ii) How many sister chromatids will it have at metaphase 1 ? iii) How many chromosomes will the cells have at metaphase II ? iv) How many sister chromatids will the cells have at metaphase II? v) How many chromosomes will the cells have after telophase II ? vi) How many cells will there be after...
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underers meiosis, how many cells will result, 12) If a eukaryotic cell has 20 chromosomes and and how many chromosomes will they contain? A) 4 cells, each with 20 chromosomes B) 4 cells, each with 10 chromosomes C) 2 cells, each with 10 chromosomes D) 2 cells, each with 20 chromosomes Answer: 13) Crossing over occurs during which stage of meiosis? A) telophase I B) metaphase II C) anaphase II D) prophase II E) prophase I Answer: 14) Which of...
If a diploid organism has 8 pairs of homologous chromosomes and one of the 8 pairs is the pair of sex chromosomes. How many total chromosomes does the organism have? How many total autosomes does the organism have? How many chromosomes do gametes of this organism have?
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