Which of these is not true about interferons

Rick’s class plans to study the effect of eating different breakfast foods on grades in morning classes. Students in the class w

Alborosie

Some of the things that would make the experiment invalid would be, if there was a variation in the behavior of the class with respect to food - for example, if some people ate their breakfast earlier than the others. This then would mean that some students would have already digested their breakfast during the morning classes and the others would still be digesting.

4 0

3 years ago

Read 2 more answers

The earth's surface features are constantly changing in a process known as

maksim [4K]

The earth's surface features are constantly changing in a process known as weathering and erosion. Weathering would happen when rocks would break physically like frost shattering while erosion happens when sediments and rocks are moved from one place to another by agents like water, gravity, wind and ice. These two occurrences are the cause of the constant change of the Earth's surface.

8 0

3 years ago

The curly toe phenotype is controlled by 4 genes that act in an additive manner. The environment does not have an effect on this

Sergio [31]

Answer:

What is the highest number of risk units an individual can have with this model? 48 units of risk
What is the phenotype of an individual of genotype AaBbCCDd? The individual has curly toes
Is it possible for them to have a child with curly toes?

Yes, the couple can have children with curly toes.

Explanation:

Available data:

The curly toe phenotype is controlled by 4 diallelic additive genes
Genes A, B, C, D
A dominant allele has 6 units of risk
A recessive allele has 2 units of risk
Individuals with more than 35 units of risk have curly toes
Individuals with 35 or fewer risk units have straight toes

The term quantitative heritability refers to the transmission of a phenotypic trait in which expression depends on the additive effect of a series of genes.

Polygenic heritability occurs when a trait results from the interaction of more than one gene. And these genes can also have more than two alleles. The action of many genes and alleles can cause many different combinations that are the reason for genotypic graduation.

Quantitative traits are those that can be measure, such as longitude, weight, eggs laid per female, among others. These characters do not group individuals by any precise and clear categories. Instead, they group individuals in many different categories that depend on how the genes were intercrossed and distributed during meiosis. The result depends on the magnitude in which each allele contributes to the final phenotype and genotype. When they interact, they create a gradation in phenotypes, according to the level of contribution.

According to this information, and knowing how each allele contributes to the risk, we can say that the minimum units of risk are 16, determined by the recessive genotype aabbccdd. Each recessive allele contributes with 2 units of risk, so (aa=4units + bb=4 units + cc=4 units + dd=4 units) = 16 units.

Each time a dominant allele is present in the genotype, it adds 6 units to the total risk.

What is the highest number of risk units an individual can have with this model?

48 units of risk, which corresponds to the genotype AABBCCDD. Each dominant allele contributes 6 units to the risk. There are 8 dominant alleles, so, 8x6=48 units.

What is the phenotype of an individual of genotype AaBbCCDd?

The individual has curly toes because it has a risk of 36 units, which is superior to the limit of 35 units. Dominant alleles A, B, C, C, D contribute with 30 units of risk (6x5), and recessive alleles a, b, d contribute 6 units of risk (3x2).

Cross:

Parentals) AAbbCcDd x AaBbCCDd

Gametes) AbCD, AbcD, AbCd, Abcd

ABCD, ABCd, AbCD, AbCd, aBCD, aBCd, abCD, abCd

Punnett square) AbCD AbcD AbCd Abcd

ABCD AABbCCDD AABbCcDD AABbCCDd AABbCcDd

ABCd AABbCCDd AABbCcDd AABbCCdd AABbCcdd

AbCD AAbbCCDD AAbbCcDD AAbbCCDd AAbbCcDd

AbCd AAbbCCDd AAbbCcDd AAbbCCdd AAbbCcdd

aBCD AaBbCCDD AaBbCcDD AaBbCCDd AaBbCcDd

aBCd AaBbCCDd AaBbCcDd AaBbCCdd AaBbCcdd

abCD AabbCCDD AabbCcDD AabbCCDd AabbCcDd

abCd AabbCCDd AabbCcDd AabbCCdd AabbCcdd

F1) 16 /32 = 1/2 individuals in the progeny are expected to have curly toes

16 /32 = 1/2 individuals are expected to have straight toes

Is it possible for them to have a child with curly toes?

Yes, the couple can have children with curly toes.

To have curly toes, individuals must have more than 35 units of risk.

To have more than 35 units, individuals´ genotypes must carry at least 5 dominant alleles (which equal 30 units).

8 0

3 years ago

A plant scientist was hired by a greenhouse operator to devise a way to force iris plants to bloom in the short days of winter.

Ksju [112]

Answer:

Interrupt the long winter nights with a brief period of light.

Explanation:

Long day plants, also called short night plants, flower when the dark period is equal or less than the critical period specific for the species. These plants normally flower in summers when nights are short and days are longer. Winters have a long dark period and do not support flowering in shirt night plants.

A continuous dark period is critical for flowering. A short night plant can flower in winters (having longer dark periods) if the dark period is interrupted by exposing the plant with a flash of light. To make short night plants, such as iris to flower in winters, the plant should be given short period of light after completion of critical dark period.

3 0

3 years ago

The English words archaeology and archetype are derivatives of the Greek word arkhaios. Based on this information, what is the m

egoroff_w [7]

The most likely meaning of this world would be c - ancient. This is probably true because when you think about it, when you're talking about an archetype, you're not talking about something dead nor extinct, neither about ruins, but you might be talking about something ancient - and the same goes for archaeology.

8 0

3 years ago