Answer:
47
Explanation:
We all know that gametes like egg cell and sperm have haploid set of chromosomes but here as per this question she has produced 2 copies of chromosome 21. For the sake of maintaining haploidy, she was supposed to have only a single copy of chromosome 21 as a result of which her egg cell was supposed to have 23 chromosomes not 24.
But, this is a case of non dis-junction. Also, in a normal sperm there are no such copies of any chromosome i.e. there is a haploid set of chromosomes. It means that sperm must be having only 23 chromosomes. So we can easily infer that when the egg cell and sperm will fuse, the zygote will have 47 chromosomes (24 from egg cell and 23 from sperm).
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❖ Structures called spindle fibers are attached to the centromeres. Spindle fibers divide the genetic material in a cell (sister chromatids).
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Answer:
Your answer is <u>True</u>. :^)
Explanation:
Ribosome- both
endo reticulum- both
golgi apparatus- both
cell wall- plant only
vacuoles- plant only
lysosomes- animal only
mitochondria- both
cell membrane- both
cytoplasm- both
chloroplasts- plant only
