About the 6 Types of Fossils
Let us go through the six types of fossils.
1.Direct Fossils: The direct fossils are those fossils, which are formed by the burial of dead living organism and the remains as if skeleton gets preserved due to sediment and results in direct fossil.
2.Ichnofossils: Ichnofossils are the fossils, which are formed out of the parts that do not belong to living organisms, like eggs or nests or footprints or feces.
3.Chemofossils: Chemofossils are the fossils, which are made up of chemicals that have been left by the earlier life forms. They are the biological signals to provide a mean of communication to organisms.
4.Resin Fossils: Organisms which are trapped in the amber and which are wholly preserved for millions of years. They are in form of bacteria and fungi and sometimes, insects can also be found .
5.Living Fossils: These fossils bear a strong similarity with the species, which had before identified only through the fossil record. It is the term, which is generally, applied either for formerly undiscovered life forms.
6.Body fossils: it is found in the hard parts of the body, which includes the bones or claws and teeth.
Answer:
11. B 12.D
Explanation:
Mammoths lived in Tundra,
less flowers= less pollination= less apples
Answer:
Natural disasters are caused due to different reasons like soil erosion, seismic activity, tectonic movements, air pressure, and ocean currents etc. Natural activities taking place in the earth's crust, as well as surface, are the main reasons for these disasters.
<span>The two identical chromosomes that result from DNA replication are referred to assister chromatids. Sister chromatids are held together by proteins at a region of the chromosome called the centromere.</span>
1. Galactosemia is a disease that will only be expressed when a person is<span><span><span> homozygotic recessive for that trait. It's the same as saying it </span> has</span> 2 recessive alleles.
Dominant allele-</span><span> G
recessive allele- g
</span>
Homozygotic dominant: GG <span><span>(doesn't express the disease)
</span>Heterozygotic : Gg (doesn't express the disease)
Homozygotic recessive: gg (expresses it)</span>
2.
-Mary has this genotype: G_ . This means it can be GG or Gg
-The exercise already says that justin's mother is GG (<span>Homozygotic dominant)
</span>- If his mother is GG, one of these G's is going to be passed to Justin. So, his genotype is either GG or Gg. Since we are not sure we write as: G_.
Justin's genotype: G_
3.
-Justin's uncle has galactosemia so his genotype is: gg
-If the uncle was able to receive two recessive alleles it means the mother had one to pass, and so did the father. However, in the diagram, it's not pointed out that they have a disease so it only leaves one possible genotype: Gg. Justin's grandparents are both Gg.
4. The last person to analyze is Justin's father.
If we crossed the grandparents (Gg x Gg) we could obtain these genotypes: GG, Gg, gg.
Justin's father doesn't express the trait, so it's not gg. That leaves us with either GG or Gg. Since we can't know for sure, onece again we write as G_
Justin's father: G_
