Answer:
Proteins and lipids
Explanation:
They are made up of mostly lipids, only certian substances can move through. Phospholipids are the most abundant type of lipid fou d in the membrane. So basicly the phospholipids are made up of two layers the outer and the inner layers.
Answer:
- Sister chromatids are not homologous chromosomes.
- Crossing over occurs between non-sister chromatids.
Explanation:
- "<em>Sister chromatids are not homologous chromosomes</em>". IT APPLIES.
- One chromatid is a chromatin strand that got thick after folding. The chromatin strand is the DNI double helix associated with histones. Before cellular division, the chromatin strand generates a copy or clon, so both of the daughter cells can get the same genetic information. These two strands keep joint together by a centromere. The chromosome is conformed by the chromatin strand and its copy, condensated and joint by the centromere. It looks X-shaped. The chromatin strand and its clon are known as sister chromatids, and they are together on the same chromosome. So one chromosome is composed of two chromatids.
- Homologous chromosomes are those that give information for the same trait, but this information is not necessarily the same. For example, both homologous chromosomes might give information for hair color trait, but one of them gives information for brown hair and the other one gives information for black hair.
2. "<em>Crossing over occurs between non-sister chromatids"</em>. IT APPLIES.
- Crossing-over occurs <u>between two homologous chromosomes</u> in the equatorial plane, that makes the daughter cells to be genetically different from the original one.
3. "Sister chromatids are found on two different homologs". IT DOES NOT APPLY.
- The chromatin strand and its clon, known as sister chromatids, are together on the same chromosome. <u>So one chromosome is composed of two chromatids. </u>
4. <em>"A chiasma forms between four molecules of double-stranded DNA on duplicated homologous chromosomes". </em>IT DOES NOT APPLY
- Chiasma is the point where two chromatids interchange genetic information making a place to new genetic material or information that will be inherited to descendants. Chiasma allows the crossing-over between <u>two homologous chromatids</u>, one of each parent.
I think it is control group
Answer:
Fertilization occurs when the nucleus of both a sperm and an egg fuse to form a diploid cell,
Explanation:
The black fur is dominant over white(light) colour which means black fur trait only require one copy of allele to express itself.
Key
B=black
b=white
- Provided that the genetic cross is between genotype (BB) and (bb).
so, the probability that the offspring of this cross will have black fur is 100%.
2. Provided that the genetic cross is between genotype (Bb) and (bb).
so, the probability that the offspring of this cross will have black fur is 50%.