<span>(According to Reference)
Whereas an onion epidermal cell has a cell wall, a human cheek cell does not. Instead, a semi-permeable membrane surrounds the cytoplasm of the cheek cell. While there are chloroplasts present in onion cells, they are absent in cheek cells. </span>
Answer: Cells have different shapes because they do different things. Each cell type has its own role to play in helping our bodies to work properly. Their shapes help them carry out these roles effectively.
I hope this helped!
Answer:
a) egg
b) mitosis
c) meiosis
e) cytoplasm
f) fertilization
g) fertilization ?
h) gene
Explanation:
couldn't answer all of them but hope this helps.
Answer:. Nondisjunction during meiosis I in either the male and female gamete
The failure of homologous chromosome to separate at mitosis, or failure of sister chromatids to separate at Anaphase of meiosis I or ii is called non-disjunction.
In this cell division anomaly the unsegregated chromosomes are separated into cells as single chromosomes, therefore extra copies are therefore inherited.This result is one of the cell having an extra copies of chromosomes than others( chromosomes 21.
If this extra chromosome copies is segregated into a sperm or egg, the resulting zygote cells will have extra copy as chromosome 21, and hence Down syndrome.
→It is more common in Meiosis 1 than ii,because of longer duration of the first stage of division than meiosis ii,given rooms to errors.
→Most common in women(with age increase) than men because of exchange of telomeres in them,which worsen with age. Their Meiotic mechanism which weaken with age, and more prone to errors compare to men,
Explanation:
<span>a. glucose and oxygen
</span><span>
Photosynthesis is the process by which the plants make their food with the help of sunlight. This food helps the plant to live and grow. The by-products created by photosynthesis are glucose and oxygen. The glucose is used by the plants for growth and oxygen is released in the air. </span>
