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schepotkina [342]
3 years ago
11

Earlobes can be either attached or detached. The allele for attached earlobes is recessive (e), and the allele for detached earl

obes is dominant (E). What must be true if a boy is born with attached earlobes? A. He has no recessive alleles. B. He has a homozygous genotype. C. He has a heterozygous genotype. D. He has one of each allele.
Biology
2 answers:
erastovalidia [21]3 years ago
6 0

Answer:

The correct answer is option B.

Explanation:

The attached earlobes refer to a recessive trait, thus, it needs the existence of the two copies of the recessive allele in order to generate the particular trait. Hence, the boy must be homozygous recessive for the trait.  

However, it is possible only in three circumstances that the boy can possess attached earlobes. That is, when both the parents are heterozygous for the trait, when both the parents possess attached earlobes, or when one parent is homozygous recessive and the other is heterozygous for the same.  

TiliK225 [7]3 years ago
4 0

Answer:

Option B, He has a homozygous genotype

Explanation:

A dominant allele is one which will overshadow the expression of recessive allele. Thus, when a dominant allele and recessive allele appears together in the genotype of offspring , only the trait associated with the dominant allele is expressed. Therefore , if a recessive allele trait is to be expressed , the offspring must have both the recessive allele

Let us see case here

A. Allele for attached earlobes is recessive (e)

B.  Allele for detached earlobes is dominant (E)

If offspring has EE genotype, then he/she would have detached earlobes

If offspring has Ee genotype, then also he/she would have detached earlobes as in heterogyzous genotype traits of dominant alleles are expressed.

If offspring has ee genotype, then only he/she would have attached earlobes

Genotype ee is a homozygous recessive genotype

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Founder effect is the example of migration of a random few individuals from one population to a new area to establish a new population.Thus, option C is correct.

What is migration?

Migration is defined as movement of individuals from one place to another in search of employment and livelihood.Some people lives permanently after migration and some returns back to the native place.

Internal migration is the type of migration in which people migrate within state and country.

External migration is the migration to different state and country.

The phenomenon of moving into new place is known as immigration.

Seasonal migration is the migration in which animals or humans migrate in a particular season due to climatic condition.

Therefore,migration of a random few individuals from one population to a new area to establish a new population is an example of founder effect.

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The question is seems to be incomplete the question is may be like that

Migration of a random few individuals from one population to a new area to establish a new population is an example of _

A) bottleneck effect

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8 0
1 year ago
How is nitrogen from the atmosphere the abiotic part of the ecosystem converted in to the biotic part of the ecosystem in organi
AveGali [126]

Solution:

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By which free nitrogen (N2) is extracted from the atmosphere and converted (fixed) into nitrogen compounds which are plant nutrients (fertilizer). In nature, this process is carried out by certain bacteria (present in the root nodules of legumes such as beans and peas), blue-green algae, and the lightning flash.

Thus the Nitrogen form the atmosphere the biotic part to the ecosystem converted into the biotic part.

7 0
3 years ago
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coldgirl [10]

Answer:

The correct answer is :

Independent Variable:  side of the shower with lemon juice

Dependent Variable:  cleanliness of shower

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Explanation:

Independent variable in any experiment is the variable that is changed or manipulated as here side of the shower that is sprayed with lemonade juice is manipulated to see if there is any effect on the cleanliness of shower.

Dependent variable is the variable that is observed or measured to check if manipulated variable or independent variable have any effect on it, like the cleanliness is measured to check if lemonade juice clean the slime of the side or not.

The control is something that remains the same to check the condition or effect that is not changed or can be compared to it. Water spray is control in this case.

The conclusion of this experiment is that there is no effect of lemonade juice on the cleanliness of slime present in the shower

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