How do strides indicate whether the walker is a male or female?

Okay, When humans arrived in "North America" Was it,

Masja [62]

In the 1980s, archaeologists from the Florida Museum of Natural History opened a formal excavation in one particular sink. Below a layer of undisturbed sediment they found nine stone flakes that a person must have chipped from a larger stone, most likely to make tools and projectile points. They also found a mastodon tusk, scarred by circular cut marks from a knife. The tusk was 14,500 years old.

The age was surprising, even shocking, for it suddenly made the Aucilla sinkhole one of the earliest places in the Americas to betray the presence of human beings. Curiously, though, scholars largely ignored the discoveries of the Aucilla River Prehistory Project, instead clinging to the conviction that America’s earliest settlers arrived more recently, some 13,500 years ago. But now the sinkhole is getting a fresh look, along with several other provocative archaeological sites that show evidence of an earlier human presence in the Americas. Around 135,000 years ago, sea levels were lower and what is now Siberia and Alaska were connected by a land bridge. That offered an easy route for bison and perhaps wooly mammoths to migrate from Asia to North America. Early humans easily could have followed, whether those “humans” were Homo sapiens, Homo erectus, Neanderthals, or little-understood Denisovans. But even if they were a different species, they were likely similar to modern humans, capable of verbal communication and with the knowledge of various survival skills. Does this solve your question?

3 0

4 years ago

Is a meander predominantly formed by erosion or deposition?

xz_007 [3.2K]

Answer:

Meanders change position by eroding sideways and slightly downstream. ... Thus by eroding its outer bank and depositing material along its inner bank, a stream moves sideways without changing its channel size. Due to the slope of the channel, erosion is more effective on the downstream side of a meander

Explanation:

hi

3 0

3 years ago

Biology lab 14 experiment 1 punnett square crosses post lab questions

djverab [1.8K]

Complete question: PUNNETT SQUARE CROSSES

1. Set up and complete Punnett squares for these crosses (remember Y = yellow, y = blue):

a. YY and Yy

b. YY and yy

2. Answer these questions: a. What are the resulting phenotypes? b. Are there any blue kernels? c. How can you tell whether or not there are blue kernels?

3. Set up and complete a Punnett square for a cross of two of the F1 from Step 1 (above).

4. Answer these questions: a. What are the genotypes of the F2 generation? b. What are their phenotypes? c. Are there more or fewer blue kernels than in the F1 generation?

5. Identify the four possible gametes produced by the following individuals (S = smooth, s = wrinkled):

a. YY Ss

b. Yy Ss

Punnett squares are used to get the genotypic and phenotypic frequencies among the progeny produced from a cross. Punnett squares and answers below.

<h3>What is a punnett square?</h3>

The Punnett square is a graphic representation that shows the different types of gamete combinations according to the alleles involved in a cross.

Punnett square shows the probabilities of getting offspring with different genotypes and their consequent phenotypes.

In the exposed example,

Diallelic genes that codes for color

Y = yellow ⇒ dominant allele

y = blue ⇒ recessive allele

We will assume complete dominance, meaning that genotypes with at least one dominant allele will express yellow.

1)

a- Cross 1

Parentals) YY x Yy

Gametes) Y Y Y y

Punnett square) Y Y

Y YY YY

y Yy Yy

F1) Genotype

1/2 = 50% of the progeny is expected to be h0m0zyg0us dominant, YY

1/2 = 50% of the progeny is expected to be heter0zyg0us, Yy

Phenotype

100% of the progeny is expected to be yellow.

b- Cross 2

Parentals) YY x yy

Gametes) Y Y y y

Punnett square) Y Y

y Yy Yy

F1) Genotype

100% of the progeny is expected to be heter0zyg0us, Yy

Phenotype

100% of the progeny is expected to be yellow.

2)

a. What are the resulting phenotypes? Only yellow kernels

b. Are there any blue kernels? No

c. How can you tell whether or not there are blue kernels?

Blue is the recessive phenotype for kernels. Assuming complete dominance, since all genotypes are expected to carry at least one dominant allele, all the F1 kernels are yellow.

3) Let us cross two heter0zyg0us individuals from the F1

Parentals) Yy x Yy

Gametes) Y y Y y

Punnett square) Y y

Y YY Yy

y Yy yy

F1) Genotype

1/4 = 25% of the progeny is expected to be h0m0zyg0us dominant, YY

1/2 = 50% of the progeny is expected to be heter0zyg0us, Yy

1/4 = 25% of the progeny is expected to be h0m0zyg0us recessive, yy

Phenotype

75% of the progeny is expected to be yellow.

25% of the progeny is expected to be blue.

4)

a. What are the genotypes of the F2 generation?

- 25% YY (h0m0zyg0us dominant)

- 50% Yy (Heter0zyg0us)

- 25% yy (H0m0zyg0us recessive)

b. What are their phenotypes?

- 75% yellow kernels

- 25% blue kernels

c. Are there more or fewer blue kernels than in the F1 generation?

More. Blue kernels appeared in the F2.

5. Assuming independent genes, the resulting gametes after meiosis are as follows

Gametes

a. YY Ss ⇒ YS, YS, Ys, Ys

b. Yy Ss ⇒ YS, Ys, yS, ys

You can learn more about punnett squares at

brainly.com/question/25357981

#SPJ1

7 0

2 years ago

How are electromagnetic waves including light waves,classified?

Delvig [45]

Answer:

Electromagnetic waves can be classified and arranged according to their various wavelengths/frequencies; this classification is known as the electromagnetic spectrum. ... These types of energy include infrared (IR) rays (heat waves given off by thermal bodies), microwaves, and radio waves

Explanation:

6 0

3 years ago

As the amount of primary consumers increases, the amount of secondary consumers will _______.

Ray Of Light [21]

Increase. This is because they will have more prey.

3 0

4 years ago