which of these pieces of evidence supported alfred wegener's original theroy of the contineltal drift

Ivenika [448]

Answer:

<h2>Explanation: Anaerobic bacteria can sustain itself without the presence of oxygen. Almost all animals and humans are obligate aerobes that require oxygen for respiration, whereas anaerobic yeast is an example of facilitative anaerobe bacteria.</h2><h2>Hope it helps..</h2>

7 0

3 years ago

Read 2 more answers

Which answer choice best explains why tractor trailers take more time to speed up and slow down than regular cars?

lawyer [7]

Answer:

sorry but i need the points

Explanation:

3 0

3 years ago

Turgor pressure is the pressure exerted on a plant cell wall by water. When wilted plants are placed in water, they demonstrate

Rus_ich [418]

Answer: When wilted plants are given water, it enters the cell generating turgor and giving a firmer appearance, and this water is stored in the vacuoles.

Explanation:

Turgor is a phenomenon in plant cells in which the cell expands due to the pressure exerted by the fluids and also by the cell content on the walls. It is related to osmosis, since the external pressure is usually very high and this internal pressure dilates the cell as much as the elasticity of the membranes allows. Then, the cells swell by absorbing water, tensing the membranes because of the pressure against them. When the fluid exerts outward pressure on the cell wall it is called turgor pressure. Whereas, the inward pressure exerted on the cell contents by the stretched cell wall is called wall pressure. Generally, both pressures, turgor pressure and wall pressure, are counterbalanced and balanced.

So, this pressure of turgor facilitates the elongation of the cells in the plant, and also, the cells use this phenomenon to regulate the transpiration through the opening and closing of the stomach.

Thereby, the turgor of a living cell is influenced by three primary factors:

An adequate supply of water.
The formation of osmotically substances.
A semi-permeable membrane.

Vacuoles are organelles bounded by a single membrane and present in plant and fungal cells, and where water is stored. Plant cells control their turgor pressure through the movement of water into or out of vacuoles. When wilted plants are given water, it enters the cell generating turgor and giving a firmer appearance, and this water is stored in the vacuoles.

3 0

3 years ago

In gel electroscopes, the smallest fragments travel?

devlian [24]

The smallest fragments travel the fastest because a smaller molecule has less resistance making it easier to travel through the gel.

4 0

3 years ago

In your experiment, you found the following offspring only:Tall green: 626 offspring.Tall yellow: 313 offspring.Short green: 309

Karo-lina-s [1.5K]

Complete question:

1. You found a new species of garden pea and have decided to repeat Mendel’s experiments. You have obtained two true-breeding pea plants that are tall (T) with yellow pods (g), and short (t) with green pods (G), respectively. Capital letters indicate dominant traits.

a. What is the genotype and phenotype of the F1 generation? (2p)

b. You allowed self-fertilization in F1 generation and obtained F2 generation. Using Punnett square to obtain the phenotypes, genotypes and their respective ratios. (4p)

2. If you obtained 1248 offspring in the F2 generation in Question 1, calculate how many offspring of each phenotypic class you would expect to have. (4p)

3. When you finish questions 1 and 2, under what assumption/hypothesis did you perform your analysis/calculation? Is there an alternative assumption/hypothesis, which may result in a different conclusion? If yes, what is the alternative assumption/hypothesis and what kind of offspring and in what numbers do you expect to obtain? (4p)

4. You only need to answer A or B to get this 6p. Please indicate which question you are answering. In your experiment, you found the following offspring only: Tall green: 626 offspring. Tall yellow: 313 offspring. Short green: 309 offspring.

A: If you stay with your original hypothesis/assumption, test it using chi2 test and analyze the result (whether you want to reject the hypothesis and why).

B: If you believe that the alternative hypothesis fits better with your data, test it using chi2 test and analyze the result (whether you want to accept the hypothesis and why).

Answer:

1) a. 100% of the progeny will be dihybrid, TtGg, exhibiting the phenotype

Tall plants with green pods.

b. F2 Gentotype:

1/16 TTGG
2/16 TTGg
1/16 TTgg
2/16 TtGG
4/16 TtGg
2/16 Ttgg
1/16 ttGG
2/16 ttGg
1/6 ttgg

F2 Phenotype:

9/16 Tall plants with green pods (T-G-)
3/16 Tall plants with yellow pods (T-gg)
3/16 Short plants with green pods (ttG-)
1/16 Short plants with yellow pods (ttgg)

Phenotypic ratio → 9:3:3:1

2) T-G- → 702 individuals

T-gg → 234 individuals

ttG- → 234 individuals

ttgg → 78 individuals

3)

Null Hypothesis: The population is under Hardy-Weinberg equilibrium. The alleles of this population assort independently.

Alternative Hypothesis: The population is not in equilibrium. Alleles do not assort independently.

4) a. There is enough evidence to reject the null hypothesis, meaning that the difference between the observed number of individuals and the expected ones is statistically significant. The population is not under equilibrium H-W. Alleles do not assort independently.

Explanation:

1) 1st Cross: True-breeding tall (T) with yellow pods (g) pea plant with a short (t) with green pods (G) plant

Tall and Green pods are the dominant traits,
Short and yellow pods are recessive traits.

Parentals) TTgg x ttGG

Gametes) Tg, Tg, Tg, Tg tG, tG, tG, tG

F1) 100% of the progeny will be dihybrid, TtGg, exhibiting the phenotype

Tall plants with green pods.

2nd Cross: F1 self-fertilization

Parentals) TtGg x TtGg

Gametes) TG, Tg, tG, tg

TG, Tg, tG, tg

Punnett square) TG Tg tG tg

TG TTGG TTGg TtGG TtGg

Tg TTGg TTgg TtGg Ttgg

tG TtGG TtGg ttGG ttGg

tg TtGg Ttgg ttGg ttgg

F2) Gentotype:

1/16 TTGG
2/16 TTGg
1/16 TTgg
2/16 TtGG
4/16 TtGg
2/16 Ttgg
1/16 ttGG
2/16 ttGg
1/6 ttgg

Phenotype:

9/16 Tall plants with green pods (T-G-)
3/16 Tall plants with yellow pods (T-gg)
3/16 Short plants with green pods (ttG-)
1/16 Short plants with yellow pods (ttgg)

Phenotypic ratio → 9:3:3:1

2) The total number of individuals in the F2 is 1248.

16 ----------------- 1248 individuals --------------- 100% of the progeny

9 T-G- ----------- X = 702 individuals-------------X = 56.25%

3 T-gg ----------- X = 234 individuals ----------- X = 18.75%

3 ttG- ------------- X = 234 individuals ---------- X = 18.75%

1 ttgg ------------- X = 78 individuals ------------ X = 6.25%

3)

Hypothesis: The population is under Hardy-Weinberg equilibrium. The alleles of this population assort independently.

Alternative Hypothesis: The population is not in equilibrium. Alleles do not assort independently

4) F2 composed of:

Tall green: 626 offspring.
Tall yellow: 313 offspring.
Short green: 309 offspring.

Tall/Green Tall/Yellow Short/Green Short/Yellow

Observed 626 313 309 0

Expected 702 234 234 78

(Obs-Exp)²/Exp 8.23 26.7 24 78

X² = Σ(Obs-Exp)²/Exp = 8.23 + 23.7 + 24 + 78 = 136.93 ≅ 137

Freedom degrees = genotypes - number of alleles = 9 - 4 = 5

Significance level, 5% = 0.05

Table value/ Critical value = 11.07

X² = 137

X² > Critica value

137 > 11.07

There is enough evidence to reject the null hypothesis, meaning that the difference between the observed number of individuals and the expected ones is statistically significant. The population is not under equilibrium H-W. Alleles do not assort independently.

5 0

3 years ago