Flemming divided mitosis into two broad parts: a progressive phase, during which the chromosomes condensed and aligned at the center of the spindle, and a regressive phase, during which the sister chromatids separated.
Answer:
D
Explanation:
The Gulf Stream brings warm water from the Gulf of Mexico all the way up to the Norwegian Sea.
Check out the image to see the movement of water.
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Answer:
In a homozygous state, the allele "P" is lethal. Those individuals with PP genotype will be born dead.
Explanation:
The allele P is dominant over p and expresses the trait "platinum". But in the homozygous state, it is mortal, PP. The allele p expresses the "Silver" trait.
This is:
- For platinum individuals, the genotype should be Pp
- For silver individuals, the genotype should be pp
- For dead individuals, the genotype should be PP.
So in the crosses, the punnet squares are:
1- Silver x Silver
Parental) pp x pp
Gametes) p p p p
Punnet square)
p p
p pp pp
p pp pp
F1 Genotype) 100 % recessive homozygote pp
2- Silver x Platinum
Parental) pp x Pp
Gametes) p p P p
Punnet square)
p p
P Pp Pp
p pp pp
F1 Genotype) 50 % recessive homozygote pp,
50% heterozygote for the trait Pp
3- Platinum x Platinum
Parental) Pp x Pp
Gametes) P p P p
Punnet square)
P p
P PP Pp
p Pp pp
F1 Genotype) 25 % recessive homozygote pp
50% heterozygote for the trait Pp
25% dominant homozygote PP. This is a dead
individual.
In this last cross, individuals with genotype PP dye, so, of the whole offspring, there are two platinum for each silver offspring.
He was Catholic, but had many sympathies towards Protestant ideas, especially Martin Luther’s.
Answer:
Xylem developed to transport water from the plant’s roots to the rest of the plant.
Explanation:
A waxy cuticle is usually present to reduce water loss, whereas spines are often in place that help plants avoid being eaten by herbivores.
Stomata are key for gas exchange, and actually permit the release of water. Water is taken up through the roots, not the stomata
All plant cells have nuclei, which is the organelle in which DNA is stored. The seeds did not develop to provide a place for the storage of genetic information.
However, the xylem is an important part of the plant vascular transport system that ensures water is transporter from the roots to the leaves. This is an important adaptation for land plants as it ensures all parts of the plant get a water supply, particularly the leaves that are undergoing photosynthesis.