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2 years ago

Which organisms evolved from the common ancestor Pakicetus?

2 answers:

8 0

Hippos likely evolved from a group of anthracotheres about 15 million years ago, the first whales evolved over 50 million years ago, and the ancestor of both these groups was terrestrial. These first whales, such as Pakicetus, were typical land animals. They had long skulls and large carnivorous teeth. Hope I’ve helped ;)

velikii [3]2 years ago

5 0

Answer:

3.whales and hippos

Explanation:

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what questions and answers lead you to the decision that an organism is from the kingdom Archaebacteria

Arte-miy333 [17]

Explanation: we will conclude this by the following characteristics:

1.organims that lack a proper nucleus.

2.they have membrane bounded organelles

3.they are tiny single cell oraganisms which cannot be seen by naked eye.

4.they are the oldest livinh organisms on earth

5.they are present in very harsh conditions like volcanic vents or at the bottom of the sea

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2 years ago

Gene A has two alleles (A1 and A2). A1A1 homozygotes are twice as likely to survive from birth to reproductive age as heterozygo

Usimov [2.4K]

Answer:

The correct answer is C: 0.60 A1 and 0.40 A2 will be the allele frequencies in those progeny when they reach reproductive age

Explanation:

Genotype A1A1  A1A2 A2A2 

Relative aptitude, w 1 0.5 0.5

Number of individuals 40 40 40

Initial allelic frequency p0= (40+20)/120=0.5 q0= (40+20)/120=0.5

Zygote frequency p2= 0.25 2pq=0.25 q2=0.625

Relative contribution 0.25x1=0.25 0.5x0.5=0.25 0.25x0.5=0.125

of each genotype

Average aptitude W W= 0.025 + 0.25 + 0.125 = 0.625

Population AA= 0.25/0.625 AB=0.25/0.625 BB=0.125/0.625

Genotype frequency AA= 0.4 AB=0.4 BB=0.2

New Allelic frequency p1=0.4+(0.4/2)=0.6 q1=0.2+(0.4/2)=0.4

Total number of individuals: 120

Initial allelic frequency:

(number of homozygote individuals + half number of

heterozygote individuals) / Total number of individuals

Relative contribution of each genotype:

Zygote frequency x Relative aptitude

Average aptitude W: It is the sum of relative contribution of each genotype to the next generation.

wA1A1 x p2 + WA1A2 x 2 x p x q + WA2A2 x q2

Population Genotype frequency:

Relative contribution of each genotype / Average aptitude

Allelic frequency:

Homozygote population genotype frequency + half

heterozygote population genotype frequency

8 0

2 years ago

For many generations, the following genotypic frequencies were observed in a large population of dinosaurs: 4 percent AA, 32 per

Usimov [2.4K]

Answer:

C) 19.7%

Explanation:

The new population distribution after climate change wiped out homozygous recessive dinosaurs is:

$AA = \frac{4}{4+32}=\frac{1}{9}$

$Aa = \frac{32}{4+32}=\frac{8}{9}$

The percentage of offspring of this new population that are homozygous recessive is given by:

$P(Aa\ x\ Aa) = \frac{8}{9} *\frac{8}{9} =\frac{64}{81} \\P(aa) = \frac{1}{4}\\P(Aa\ x\ Aa) \cap P(aa) = \frac{64}{81}*\frac{1}{4} =0.197=19.7\%\\$

19.7% of these newborn dinosaurs died

8 0

2 years ago

The graph below shows genotype percentages for generations 20 through 26. The initial genotype percentages were 34% DD, 32% Dd,

miv72 [106K]

Answer is from dd parents in this simulation it very lucky to survive as a long as they did.

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2 years ago

Use the drop-down menus to determine where these organelles can be found.

damaskus [11]

Ribosome- Both animal cells and plant cells

Endoplasmic Reticulum -Both animal cells and plant cells

Golgi Apparatus- Both animal cells and plant cells

Cell wall- Plant cells only

Vacuoles-Both animal and plant cells

Lysosomes- Both animal and plant cells

Mitochondria- Both animals and plant cells

Cell Membrane- Both animals and plant cells

Cytoplasm-Both animal and plant cells

Chloroplasts-Plant cells only

Hope it helps have a wonderful day ; )

6 0

2 years ago

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