Crossing-over results in what observable change in our cells?
a New combinations of alleles
b Gametes that are genetically identical
c Daughter cells that are diploid
Answer:
A
Explanation:
new combinations of alleles from both parents
Crossing-over results in new combinations of alleles in our cells. The correct option is a.
What is crossing over?Crossing over is a process of meiosis in which the chromosomes of similar types line up. One chromosome is from the father and the other is from the mother. The exchange of genetic material across homologous chromosomes is known as crossing-over. It results in new gene combinations on each chromosome.
When cells divide during meiosis, homologous chromosomes are dispersed randomly to daughter cells, while distinct chromosomes segregate independently of one another.
A new combination of alleles results due to crossing over, and it causes variation in offspring.
Therefore, the correct option is a. New combinations of alleles.
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Pet stores sell meal worms as food so it is important that they are fed well so the supply does not dwindle. If a pet store wanted to identify the preferred type of food for mealworms what might their investigation look like?
The kind of investigation used in the scenario above will be either primary or secondary investigation.
Why would they use primary or secondary investigation?If they wanted to carry out an investigation from scratch using their own parameters, case-controls, and random sampling from scratch perhaps so they can have control, then that would be the primary investigation.
Secondary investigation on the other hand gleans off information already researched and provided at the primary investigation level.
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A Drosophila fruit fly cell with 2N = 8 chromosomes-two of each kind- is called
Answer: haploid, diploid) cell
Explanation:
What are some indicators that the overall climate of earth is getting warmer?.
Answer
fossil fuels and climate change
Explanation
this earth is gonna die anyways
Occasionally, newborn babies are born with a yellowing of the skin. What is this condition called, and
what organ may be underdeveloped in these babies?
a. Cyanosis, the kidneys.
b. Jaundice, the liver.
c. Melanosis, the lungs.
d. Vitiligo, the digestive tract.
Answer:
B
Explanation:
jaundice and the liver is the answer to this question
Name the following structure: CH3CH₂CH₂OH A. butanol B. propanol C. ethanol D. methanol
Answer:
B. Propanol. (Propan-1-ol)
Explanation:
Propan-1-ol is a primary alcohol with the formula CH3CH2CH2OH and sometimes represented as PrOH or n-PrOH.
Hope this helps!
The first strands of DNA were observed through which microscope?
Answer:
it was tru an electron microscope.
Explanation: need any more help ask me
Carbohydrates act as "ID cards"
for cells. Where are they located?
A.the exterior of cell walls
B.inside of the nucleus
C.attached to the rough ER
D.embedded in the cell membrane
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A. The Exterior of Cell WallsHow did the lack of sea urchins change the effect of lionfish on the reef? Explain.
Explanation:
The lack of sea urchins causes the accumulation of algae on the reef leading to the growth of fish populations. The process significantly increased the invasion of lionfish in the reef. As the reef significantly depends on these fishes and the lionfish feeds on these fish species, the lionfish destroy the reef.
What happens when you add food as a selection factor??
Answer:
The addition of food increases the lives of the bunny as food sustains life and brings about nourishment.
What is the main goal of the pacific region coastal program? a. to end fishing along the pacific coast b. restore wetland and forest habitats c. provide jobs d. restore damage caused by soil erosion please select the best answer from the choices provided a b c d
The main goal of the pacific region coastal program is : ( B ) restore wetland and forest habitats
Function of pacific region programThe pacific region coastal program was established in 1999 with the goal of restoring/preserving wetlands and forest habitats. while wetlands are land areas covered by water for major parts of the year. wetlands suport the existence of various organism such as hydrophytes.
Hence we can conclude that The main goal of the pacific region coastal program is to restore wetland and forest habitats.
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In which eukaryotic organelle are various macromolecules broken down and destroyed?.
The Answer:
Lysosome.
Which factor can decrease the rate of a chemical reaction?
low activation nergy
low temperature
high concentration of enzyme
O high pressure
Answer:
low temperature since there are less molecules with energy greater than activation energy and they posses less energy to collide with each other and change into products.
Explanation:
If the dna triplets is atg-cgt, the trna anticodons are group of answer choices atg-cgt. Uag-cgu. Aug-cgu. Uac-gca
If the dna triplets is atg-cgt, the trna anticodons are Uac-gca.
Are codons triplets of tRNA?The triplet of bases that is complementary to a codon is called an anti-codon the triplet in the mRNA is called the codon and the triplet in the tRNA is called the anti-codon.
Thus, option "D" is correct.
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differences between arteries, veins and capillaries
Answer:
There are three main types of blood vessels:
1)Artery ---
i) It is a blood vessel having a thick wall.
ii) It carries blood from the heart to different parts of the body.
iii) On regulatory demand of the body it can dilate or constrict.
iv) It doesn't contain any valve.
v) All arteries carry oxygenated blood except the pulmonary artery.
2)Vein ---
i) It is a blood vessel having a thin wall.
ii) It brings blood from different parts to the heart.
iii) It can't dilate or constrict under normal conditions.
iv) It contains valves that allow the blood to flow in one direction towards the heart.
v) All veins carry deoxygenated blood except the pulmonary vein.
3)Capillary ---
i) It is a very narrow blood vessel that has very thin walls.
ii) It forms a network throughout the body in all living cells connecting arteries to veins.
iii) It can dilate or constrict according to the requirement of tissue.
iv) It doesn't have any valve.
v) It contains mixed blood as it connects arteries and veins
Why is active transport necessary
for cells?
A. Diffusion is a very slow process.
B. Molecules can only enter the cell through
ports in the membrane.
C. Sometimes molecules can't get through the
cell membrane on their own.
Answer:
B. Molecules can only enter the cell through ports in the membrane.
Explanation:
PLEASE MARK ME AS BRAINLIEST
Answer:
B. Molecules can only enter the cell through ports in the membrane.
Which abiotic factors are limiting for habitat and ecosystem development in the marine environment?
Answer:
water flow rate, salinity, acidity, oxygen, light levels, depth, and temperature
Explanation:i learned it
this is important right answers only
Which biome has the lowest temperatures?
A. Grassland
B. Desert
C. Taiga
D. Tundra
Answer:tundra
Explanation:
it has the coldest climate like Antarctica
Which substances contains thylakoids
Answer:
Chlorophyll contains thylakoids.
Which one of the 5 HIPPO threats do you think has the most impact on penguin populations? Why do you think that? Please help!!!
Answer:
Climate change
Explanation:
Climate change is ruining penguins habitat it melting away due to warming oceans and melting glaciers.
Describe a hypothetical example showing how rising sea levels due to global warming might cause extinction.
Answer:
Global warming may cause more icebergs to melt than are created. This would lead to higher sea levels. Sea levels may rise above land masses located at low elevations. As a result, the animals who lived in these areas may find their habitats shrinking and resources depleting, causing their population size to decrease. If there are particular species that were only able to survive in the areas now covered by water, they may very well become extinct.
How does stem cells serve as a repair system in our body
Answer:
They allow embryonic cells to regenerate and repair.
How does lack of moisture affect the habitability of a place?
Answer:
No
Explanation:
Mosturizer components have been tested and they is no evidence of this being a problem to humans
Radioactive decay ___?
A) produces water
B) produces a transformation from one element to another
C) two of the answers
D) none of the above
What should an
ecologist measure in order to construct a pyramid of biomass for an ecosystem?
•
A. the biomass in
each trophic level of the food web
•
B.
the total mass of all the organisms in a representative area of the ecosystem
•
C. the total mass of all the organisms in the ecosystem
•
D. the number of organisms in each trophic level of the food web
Answer:
A
Explanation:
This overcomes the size difference problem because all kinds of organisms at a trophic level are weighed.
if a person is heterozygous for cystic fibrosis is married to someone who actually has the disease. What are the chances that their child will have CF?
Answer:
50%
Explanation:
CF is a recessive trait. That means that an individual must have two copies of the recessive allele in their genotype in order to express the trait. That means that the parent with CF has genotype cc, while the parent who is heterozygous, and does not express the trait, has genotype Cc. Using a Punnett square to demonstrate the cross of these two parents will produce a probability of 50% heterozygous and 50% positive for CF.
When DNA polymerase is in contact with adenine in the parent strand, what base does it add to the
growing daughter strand?
Answer:
Heterozygous
Explanation:
The polymerase in the parent is Dominent and can mask the recessive allele
Answer:
Cytosine
Explanation:
Explain how the data support the claim that cysteine is a large polar molecule.
The data supports the claim that cysteine is a large polar molecule because concentration of cysteine is affected by mutant allele.
What is a Polar molecule?This is defined as a molecule which has a slightly positive end and a slightly negative end.
Cysteine is a large polar molecule because concentration of cysteine is affected by mutant allele therefore if complex protein is low, cysteine is not transported back and its concentration in urine is higher.
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2. Canary and Goldfinch can mate and produce offspring. Unfortunately,
these offspring do not last more than one generation. What is the most
likely explanation for this phenomenon?
• The canary and the goldfinch are ecological equivalents.
The canary and the goldfinch are the same species.
• The canary and the goldfinch are different species.
• The canary and the goldfinch are undergoing convergent evolution.
Answer:
the Canary and the goldfish are the same species
A cross section of rock layers is shown here, including a layer labeled with the letter X and an arrow. Which argument is supported by the presence of the fossilized seashells in the layer labeled 'X'? A) This layer was once a desert region. B) This layer was once beneath the ocean. C) This layer was once beneath a flooded forest. D) This layer was created by a landslide from a mountaintop.
Answer:
I dont know I need this answer too
Explanation:
Answer:
its B-this layer was once beneath the ocean.
Explanation:
