Question 1

Phenotypic features that are coded for by several genes, such as eye color in humans, are called

Accepted Answer

Phenotypic features that are coded for by several genes are called polygenic. Linked genes refer to genes that are physically close together on a chromosome and tend to be inherited together. Polytrophic and codominant are not commonly used terms in genetics.

Question 2

A person who is homozygous recessive for both blood type alleles has type ________ blood.

Accepted Answer

If a person is homozygous recessive for both blood type alleles, it means they have two copies of the recessive O allele. Therefore, their blood type can only be O.

Question 3

When does codominance occur?

Accepted Answer

Codominance occurs when both alleles in a heterozygote are expressed phenotypically in an individual, meaning that neither allele is dominant or recessive and both are expressed equally. This can result in a phenotype that shows traits from both alleles.

Question 4

A child with type O blood could not have a parent with type ________ blood.

Accepted Answer

A child with type O blood has two alleles for O blood type, one from each parent. Parents with blood type A or B can have either AO or BO genotypes, which can produce a child with O blood type if both parents pass down their O allele. However, parents with type AB blood have only AB alleles to pass down to their offspring, which cannot produce a child with O blood type. Therefore, a child with type O blood could not have a parent with type AB blood.

Question 5

The alleles responsible for the ABO blood types of humans are an example of ________ alleles.

Accepted Answer

The answer of The alleles responsible for the ABO blood...

Question 6

If a blue-colored flower crossed with a white-colored flower produced light blue-colored flower offspring, then it's most likely a case of

Accepted Answer

Incomplete dominance is when a cross between two different phenotypes results in an intermediate phenotype in the offspring. In this case, crossing a blue-colored flower with a white-colored flower resulting in light blue-colored flower offspring suggests that neither allele is dominant over the other and that they blend together to produce an intermediate phenotype.

Question 7

A woman with type AB blood has sugars on what percent of her red blood cells?

Accepted Answer

A woman with type AB blood has both A and B antigens on the surface of all her red blood cells, meaning 100% of her red blood cells have sugars associated with these antigens.

Question 8

There are NO sugars on the surface of any of the red blood cells for which blood type?

Accepted Answer

Type O blood does not have any A or B antigens on the surface of red blood cells, which also means there are no corresponding sugars (A or B antigens are made of sugars) present. Therefore, there are no sugars on the surface of red blood cells in type O blood.

Question 9

The AB blood type, in which both A and B alleles are expressed, is an example of

Accepted Answer

In codominance, both alleles are expressed and can be seen in the phenotype, which is the case for the AB blood type where both the A and B alleles are expressed equally. In incomplete dominance, the phenotype is a blend of the two alleles, which is not the case here. Independent assortment refers to how different genes segregate independently during meiosis and does not apply to the expression of a single gene. Sex linkage refers to genes located on the sex chromosomes and does not apply to blood type inheritance.

Question 10

If one person in a population has two different alleles of a particular gene and it's known that other people in the population have yet another different allele of this gene, then this is an example of

Accepted Answer

This scenario represents multiple allelism, where there are more than two different alleles of a particular gene present in a population. The presence of different alleles can lead to different phenotypic expressions. Codominance and incomplete dominance involve the expression of two different alleles in heterozygotes, while pleiotropy refers to a single gene affecting multiple traits.

Question 11

The pattern of inheritance for Rh factor is best described as ________.

Accepted Answer

The Rh factor follows a dominant-recessive pattern of inheritance, where the presence of the Rh-positive allele (dominant) results in an Rh-positive phenotype, while the Rh-negative phenotype occurs only when both alleles are Rh-negative (recessive).

Question 12

Type AB blood is a result of

Accepted Answer

Type AB blood is a result of codominance, meaning that both the A and B alleles are expressed equally in the phenotype.

Question 13

When the phenotype of a heterozygote is intermediate between both homozygotes, the pattern of inheritance is ________.

Accepted Answer

In incomplete dominance, the phenotype of a heterozygote is a blend or intermediate of the two homozygous phenotypes. This is in contrast to codominance, where both alleles are expressed equally, and independent assortment, which refers to the random distribution of non-linked genes during meiosis. Sex linkage refers to the inheritance of genes located on the sex chromosomes.

Question 14

A woman with type A blood has the alleles I^A and i. Her blood type is a result of

Accepted Answer

The answer of A woman with type A blood has...

Question 15

People with the same blood type

Accepted Answer

Blood type is determined by the presence or absence of specific antigens on the surface of red blood cells. While there are some common blood types, such as A, B, AB, and O, there are also many variations within each blood type that can be influenced by genetics. As a result, people with the same blood type may or may not be related, depending on their genetic background.

Question 16

Which statement about the inheritance of blood types in humans is correct?

Accepted Answer

The inheritance of blood types in humans is controlled by three alleles, IA, IB, and i. Both IA and IB are codominant and dominant to the recessive i allele. Therefore, option C is the correct statement as both the IA and IB alleles are dominant to the i allele. Option A and B are incorrect as they give dominance to a particular allele that is not supported by the inheritance pattern. Option D is also incorrect as it suggests codominance between the IA and IB alleles, which is not true.

Question 17

Multiple ________ occurs in the ABO blood system, where there are three distinct alleles in human populations.

Accepted Answer

The answer of Multiple ________ occurs in the ABO blood...

Question 18

A child with the genotype I^Aihas type ________ blood.

Accepted Answer

The genotype I^Ai indicates that the child has one allele for type A blood and one allele for type O blood, resulting in type A blood.

Question 19

Which of the following individuals doesn't have the Rh factor on their red blood cells?

Accepted Answer

The answer of Which of the following individuals doesn't have...

Question 20

In human ABO blood types, the alleles for A and B are said to be ________ because they're both expressed.

Accepted Answer

The answer of In human ABO blood types, the alleles...

Quiz 8: DNA Detective: Complex Patterns of Inheritance and DNA Fingerprinting