Ablack guinea pig crossed with an albino guinea pig produced 12 black offspring. when the albino was crossed with a second black one, 7 blacks and 5 albinos were obtained. what is the best explanation for this genetic situation? write genotypes for the parents, gametes, and offspring.
black appears dominant to albino
b - black (both bb and bb genotypes)
b - albino (bb genotype)
this is a problem showing that 1 phenotype (black color) can be the result of two different genotypes (bb and bb). these two crosses would be the equivalent of test crosses to determine genotype.
a black guinea pig crossed with an albino guinea pig produced 12 black offspring. this is the result (all black offspring) you would expect when breeding two true breeders (two homozygotes bb x bb).
b b
b bb bb
b bb bb
when the albino was crossed with a second black one, 7 blacks and 5 albinos were obtained. this looks like the results you would expect between a heterozygote and an albino (bb x bb).
b b
b bb bb
b bb bb

A black guinea pig crossed with an albino guinea pig producing 12 black offspring

         b         b

B     Bb       Bb

B     Bb        Bb

The genotype of the black gunea pig will be BB in this situation and the genotype for the albino pig would be bb.

The gametes formed will be B, B,b, b.

The offsprings will have genotype Bb. They will be heterozygous black.

When the albino was crossed with a second black one, 7 blacks and 5 albinos were obtained

         b            b

B      Bb           Bb

b       bb          bb

The genotype of the black parent will be heterozygous i.e Bb in this condition. The genotype of the albino parent will be bb.

The gametes formed will be B,b,b,b.

50% of the offsprings will have the probability of having heterozygous Bb genotype. 50% of the offsprings will have the probability of having albino bb genotype.

c

explanation:

idk

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.