B. They are used for display, in combat and in defense against enemies.
It passes the Roche limit a break due tidal force.
Explanation:
The name Roche limit is due to famous scientist Edouard Roche. It is known as the minimum distance which is smaller object can exist and as a body held together by itself gravity. Roche limit is also called Roche Radius.
Its minimum distance is from the center of the planet. For formation it allows the material to come together. The example is large enough moon.
Answer:
PPTt
Explanation:
Let the gene for flower colour be denoted by P. P is the dominant allele and produces purple colour, p is the recessive allele and produces the recessive colour. Let the gene for stem height be denoted by T. T is the dominant allele and produces tall stem, t is the recessive allele and produces short stem.
A test cross was done which means that one of the parents was homozygous recessive for both the traits i.e. pptt
In the progeny all the flowers had purple colour which is only possible if the test parent was homozygous dominant for the trait i.e. it was PP
PP x pp :
P P
p Pp Pp
p Pp Pp
As evident, all the flowers will have Pp genotype and hence purple colour.
In the progeny, around half of the flowers had tall stems and half had short stems. This is only possible if the test parent was heterozygous for the trait i.e. it was Tt
Tt X tt :
T t
t Tt tt
t Tt tt
As evident, half plants have Tt genotype so they will have tall stems. Half of them have tt genotype hence will have short stems.
Hence, combining the genotype for two traits we obtain the genotype PPTt of the original test pea plant.
