Explanation:
The problem says that the hairless phenotype never breeds true. That means that it's not the result of a homozygous genotype (H₁H₁ or H₂H₂), so it is caused by the heterozygous genotype (H₁H₂).
The <u>expected </u>offspring from the cross between two Mexican hairless would be:
<h3>P
H₁H₂ x
H₁H₂</h3><h3>F1 1/4
H₁H₁, 2/4
H₁H₂ and 1/4
H₂H₂.</h3>
And the <u>expected</u> phenotypic ratio 3:1. However, the observed offspring shows a 2:1 ratio. What's happening?
If the observed phenotypic ratio in the offspring of a monohybrid cross (a single gene with two alleles) is 2:1, we can suspect that one of the genotypes is lethal in homozygosis and therefore does not appear in the progeny (the puppies are born dead).
If we proposed that the H₂ allele is lethal in homozygosis, then:
- The H₁H₁ genotype would cause normal puppies --> 1
- The H₁H₂ genotype would cause hairless puppies --> 2
- The H₂H₂ is lethal and causes the death of puppies --> 0
The phenotypic ratios change to 2:1, as observed in the experiment.
Both answers C and D are correct, however, answer D makes more sense.
Answer:
Rain makes up part of earth's water cycle
Water evaporates from streams, lakes, and oceans, then condensation and precipitation occur in the form of rain.
Explanation:
I'm pretty sure this question is implying that the answers should be directly related to the water cycle. While some of the other sentences might have some truth to them, they are too vague to be considered fact, and they're not necessarily related to the process of the water cycle.
12) its harder for the cell to move around due to the extra volume and mass
13) product; reactant
14)the nucleus
15)tissues comes before the organ
16) prokaryotic and eukaryotic
17) prokaryotes do not have a nucleus
18) cell
19) the bass
20) it allows needed materials to move in and out of the cell
21) DNA flagella and nucleus
22) the higher power objective
23)
Answer:
TT, TT, Tt, Tt
Explanation:
Putting it in a Punnett square:
T t
T TT Tt
T TT Tt
