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Thursday (01/22) - Sex Linked Traits Practice and Review - Academic

Last updated about 4 hours ago

26 Nsɛmmisa

Class Practice

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Sex Linked Traits Practice

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Non-Mendelian Inheritance - Blood Typing

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B.C.6F

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Non-Mendelian Inheritance - Complete and Incomplete Dominance

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1.

What does it mean if a trait is 'sex-linked'?

The trait skips a generation

The trait is linked to the sex chromosomes

The trait is dominant

The trait is influenced by environmental factors

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B.C.6F

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B.C.6F

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8.

Why are males more likely to be affected by recessive sex-linked disorders?

Women are XY, this means that an affected X chromosome can be masked by a Y chromosome.

Males are XX, this means that an affected X chromosome can be masked by the other X chromosome.

Males are XY, this means that an affected X chromosome cannot be masked by a Y chromosome.

Women are XX, this means that an affected X chromosome can be masked by the other X chromosome.

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9.

Duchene muscular dystrophy is a sex linked trait. A not having this disease is dominant (N) to having this disease (n). A mother who is a carrier for this disease (X^NXⁿ) mates with a father that is not affected (X^NY) in the cross below.

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Based on the Punnett square for the sex linked trait, of the females will be affected.

A model of the genotype and phenotypes for Hemophilia.

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Use the table above to answer the questions that follow.

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10.

In a Punnett square for hemophilia, what does the genotype X^NXⁿ indicate about a female?

She has hemophilia

She is a carrier of hemophilia

She is not affected and not a carrier

She has other genetic disorders

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Pattern baldness is a sex-linked recessive trait.

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Important Note

BB and Bb males = bald

bb males = non bald.

Bb and bb females = non bald. BB females = bald

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13.

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25%

50%

75%

100%

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15.

In cats, coat color is codominant AND it is an X-linked trait. Meaning coat color is ONLY carried in the X chromosome.
Possible genotypes and phenotypes for females and males are shown in the table below.
Which table shows the expected phenotypes of offspring resulting from a cross between a Female Calico cat and a Male Orange cat?

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In humans, there are four types of blood: Type A, Type B, Type AB, and Type O. The alleles A (I^A) and B (I^B) are codominant to each other, and the O allele( i ) is recessive to both A and B. This means a person with Type A blood could be I^AI^A or I^Ai.

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16.

Select all genotypes that represent Type B blood.

I^BI^B

I^AI^B

I^Bi

i i

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19.

The ABO blood group has several alleles, so why does each person only have two of them?

Each parent passes on a single allele for the ABO blood type to their child.

A red blood cell lacks sufficient nucleotides to create a third allele.

A red blood cell lacks sufficient nucleotides to create a third allele.

Every allele in the ABO blood group can be classified as either dominant or recessive.

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20.

A father is heterozygous for his type I^Bi blood (BO) and the mother has type ii (OO) blood.
What are the possible blood types of babies born from this couple?

25% Type I^Ai (AO), 50% Type I^AI^B(AB), 25% Type I^Bi (BO)

50% Type I^Bi (BO), 50% Type ii (OO)

100% Type I^Bi (BO)

75% Type I^Bi (BO), 25% Type ii (OO)

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21.

In pigs, fur color is codominant. When a pig is heterozygous, it is brown with white spots.
If a pig with brown fur (BB) mates with a pig with white fur (WW), what are the phenotypes of the offspring?

100% Brown with white spots

50% Brown, 50% White

100% Brown

100% White

50% Brown, 50% Brown with White Spots

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22.

Hydrangeas are beautiful shrubs that grow in a variety of forms. Many hydrangeas originally hail from Asia and there are some natives in the Americas as well as shown below.
Hydrangeas with the genotype H^BH^Bare blue. Those with the genotype H^YH^Y are yellow. Others with the genotype H^BH^Yhave a combination of the blue and yellow flowers.
Based on the information about the hydrangeas, which statement is true?

The trait of flower coloration is incompletely dominant in hydrangeas

All hydrangeas have identical flower coloration on all flowers.

The trait of flower coloration is determined by the gene expression.

The trait of flower coloration is codominant in hydrangeas

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23.

In plants known as "four o' clocks", the allele for the dominant red flower color is Incompletely Dominant over the allele for white flowers. A gardener wants to determine which of the following Punnett squares shows a cross between a heterozygous pink-flower plant and another heterozygous pink-flowered plant.

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24.

A model of the color patterns in rabbits is shown below.
Which Punnett square will produce a 50% spotted and a 50% white coat rabbits?

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25.

In a species of birds, blue feathers (F^B) are incompletely dominant to the gene for white feathers (F^W). Individuals that are heterozygous (F^BF^W) have blue-tipped feathers.

A bird with blue-tipped feathers is crossed with a white bird. Complete the sentences below for the predicted outcome of offspring produced.

The blue-tipped feathers genotype is.

When these two fruits are crossed, will be white.

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26.

Body color for horses is determined by two Incompletely dominant alleles: brown (B^B) and cream (B^C). When a horse is heterozygous for body color, it is described as palomino (B^BB^C).
What is the expected phenotypic ratio if two palomino horses mate?

1 Brown : 2 Palomino : 1 Cream

2 Brown : 2 Cream

4 Palomino

3 Brown : 1 Cream

In humans, the allele for normal vision (N) is dominant to the allele for colorblindness (n). Colorblindness is a sex-linked recessive trait that is located on the X chromosome.

Normal vision: X^N

Colorblindness: Xⁿ

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2.

Which genotype represents a male with normal vision?

X^N Y^N

Xⁿ Yⁿ

X^N Y

Xⁿ Y

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3.

The woman who is colorblind marries a man with normal vision. What is the probability of having a son who is colorblind?

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25%

50%

100%

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4.

Colorblindness is more common in males than in females because....

Fathers pass the allele for colorblindness to their sons only

The allele for colorblindness is located on the Y chromosome

The allele for colorblindness is recessive and located on the X chromosome

Males who are colorblind have two copies of the allele for colorblindness

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5.

Liam and Allie are planning to have their first child. Liam is colorblind and concerned that he will pass this trait on to their child. Allie has normal vision. Their first child, a baby boy, is color-blind.
What is Allie's genotype?

XⁿXⁿ

X^NX^N

XⁿY

X^NY

X^NXⁿ

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6.

Liam and Allie are planning to have their first child. Liam is colorblind and concerned that he will pass this trait on to their child. Allie has normal vision. Their first child, a baby boy, is color-blind.
What is the probability that they will have a daughter who is color-blind?

100%

75%

50%

25%

0%

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7.

If a woman who is a carrier for colorblindness has a son, what is the probability that he will be colorblind?

25%

50%

75%

100%

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11.

Which Punnett square shows a 25% chance of the son having hemophilia?

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12.

Which Punnett square shows a 50% chance of the daughter being a carrier for hemophilia?

X^NX^N x X^NY

X^NX^N x XⁿY

XⁿXⁿ x XⁿY

X^NXⁿ x X^NY

A woman who is a carrier (X^BX^b)) for Baldness mates with a man who is Bald (X^bY), a recessive disease.

What percentage of their offspring will be carriers for baldness?

Show your work.

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14.

A woman who is a carrier (X^BX^b) for baldness mates with a man who is bald (X^bY), a recessive disease.
What percentage of their offspring will be bald?
Show your work.

0%

25%

50%

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17.

Select all genotypes that represent Type O blood.

i^A i

I^AI^B

I^Bi

i i

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18.

Select all genotypes that represent Type AB blood.

I^A I^A

I^BI^B

I^A I^B

i i