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2 years ago

how the process of meiosis relates to the way in which a child resembles but not an exact copy of his or her parents

1 answer:

6 0

During meiosis, crossing over takes place.But have it in mind that the daughter cells produced after meiosis are haploid, hence having half the genes of each parent. This is why a child from meiosis is not an exact copy of his/her parents.

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In the Olestra experiment conducted by researchers at the Johns Hopkins University School of Medicine, the people who ate the Ol

Volgvan

Answer:

Experimental group

Explanation:

An experimental group or the treatment group is the group or test subjects that receives a treatment in an experiment. The results is contrasted against a control group which do not receive the treatment in an experiment.

In this case, the people who ate the Olestra potato chips were the are the test subjects in the experimental group used to find answers to some varaibles in the experiment.

7 0

2 years ago

6. A scientist measures the circumference of acorns in a population of oak trees

melisa1 [442]

Answer:

6. 2 cm

8. Greater than 2 cm and less than 2 cm

Explanation:

Complete Question

6. A scientist measures the circumference of acorns in a population of oak trees and discovers that the most common circumference is 2 cm. What would you expect the most common circumference(s) to be after 10 generations of stabilizing selection?

-2 cm

-Greater than 2 cm or less than 2 cm

-Greater than 2 cm and less than 2 cm

-Can't tell from the information given

8. Refer to question 6, but this time answer what you would expect after 10

generations of directional selection.

-2 cm

-Greater than 2 cm or less than 2 cm

-Greater than 2 cm and less than 2 cm

-Can't tell from the information given

Solution -

6. In an stabilizing selection, the average trait of a given population is favored over extreme values. Hence, it can be said that one specific trait is over presented in a given population. For example – uniform human birth weight, number of eggs a bird lay etc.

Here in this case if most common circumference is 2 cm , then the tree population will try to have this trait as a stabilizing trait.

Thus, option A is correct

8. In a directional selection, the genetic variation decreases as per the environmental change. And hence the average trait will not be selected. Instead traits either higher or lower the average values will be preferred.

Thus, option C is correct

3 0

2 years ago

Place the following events of excitation in the correct order. 1) ion channels on the sarcolemma open and sodium ions enter the

Gre4nikov [31]

Answer:

4, 3 5, 1, 2.

Explanation:

The events of muscle contraction begins from the presynaptic neuron, which cause the influx of Ca+, and the release of acetycholine neurotransmitter into the synaptic cleft.

The Ach, binds with the receptors in the sarcolemma, leading to opening of Ligand gated Na+ channels. Therefore Na+diffuses in, causing depolarization, and propagation of action potential along the sarcolemma spreading to the T-tubules.

This is followed by opening of Calcium channels leading exist of Ca+ from the sarcoplasmic reticulum.

The Calcium binds with the troponin, and Tropomysoin exposed the myosin binding sites on the actin filament.Thus cross-bridge is formed by the myosin head with thin filaments which shortened the sarcomere, leading to contraction of muscle fibres.

6 0

2 years ago

Sort the different barriers into their modes of reproductive isolation. A snail with a flat disc-like shell will not be able to

Stella [2.4K]

Answer/Explanation:

Types of reproductive isolation include: temporal, ecological, mechanical, and behavioural.

A snail with a flat disc-like shell will not be able to mate with a snail having a conical shell - this is an example of mechanical isolation, where the animals are physically unable to mate due to incompatible body shapes and sizes.

The reproductive organs of male bush babies do not match with the reproductive organs of females of other bush baby species. - this is another example of mechanical isolation, as the sexual organs will physically not allow reproduction between these species

The mating call of a cricket is not recognized by a cricket of other species - this is an example of behavioural isolation, which results from incompatible mating rituals. I.e. the animals do not respond to each others mating behaviours

The signals sent by a male firefly are not recognized by the female firefly of other species. - this is also an example of behavioural isolation.

Temporal isolation is where species cannot interact because they do not have the same mating seasons or are not active at the same type of day. ?Ecological isolation occurs when two species do not come into physical contact to one another because they access different areas of the habitat. E.g. mating zones, food sources or nesting sites.

8 0

2 years ago

Read 2 more answers

The barley plant has seven pairs of chromosomes. For a gamete, the number of genetic combinations that are possible through inde

umka2103 [35]

1) The correct answer is: 128 combinations.

The genetic combinations that are possible through independent assortment can be calculated as 2^n; where n is the number of different chromosomes.

So, using this formula for 7 chromosomes:

2^7 = 128 different combinations.

2) For a zygote produced by two barley parents, the number of possible genetic combinations can be calculated as: 2^n * 2^n

So, for 7 chromosomes: 2^7 * 2^7=16384

4 0

2 years ago

Read 2 more answers