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11 Feb 2018

1. Which statement about Punnett Squares is true?

A.

Punnett Squares predict the probability of different genotypes in offspring, given the original genotypes of the parents.
B.

Punnett Squares can show us the potential genotypes for autosomal traits, but sex-linked traits are too complex to be illustrated with a Punnett Square.
C.

Punnett Squares are best utilized for polygenic, not monogenic traits.
D.

Punnett Squares are a visual representation of genetic recombination in mitosis.
E.

Punnett Squares show the exact genotypes of every four offspring.

2. Which of the following statements is true of sex-linked traits on the X chromosome?

A.

Only females have sex-linked traits on the X chromosome.
B.

Only females pass on X chromosomes.
C.

Males always inherit these traits from their fathers.
D.

Males always inherit these traits from their mothers.
E.

Females are considered hemizygous for sex-linked traits on the X-chromosome.

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Trinidad Tremblay
Trinidad TremblayLv2
12 Feb 2018
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Females inherit X-linked traits from their maternal parent only.
Females can inherit a gene for an X-linked trait from either parent.
Males inherit X-linked traits from their paternal parent only.
Males can inherit a gene for an X-linked trait from either parent but normally inherit it from their fathers.
Males can inherit a gene for an X-linked trait from either parent but normally inherit it from their fathers.

Please explain, and no hand-written work please, please type answer

Sex-Linked Traits (traits located on the sex chromosomes—usually the X chromosome)

Follow the directions for the lab. Enter data you obtain for the following crosses and answer questions on this answer sheet. (NOTE: The traits used in this Module 3 Lab are sex-linked. Therefore, you CANNOT click the “ignore sex” button for these crosses. You need to see separate results for males and females to analyze data for sex-linked traits.)

Question: In this lab exercise, should you click the "ignore sex" button for the crosses?

1. a. Perform a monohybrid cross between a female fly with a tan body and a wild-type male fly. Show results for the F1 offspring. (NOTE: You will use these F1 flies in the next cross.)
ENTER DATA HERE:

Question: Are the phenotypes of the F1 offspring what you would have predicted for this cross: why or why not?

Question: Each F1 female received a tan allele from her mother and a wild allele from her father. Why do all of the F1 females show the wild-type phenotype?

Question: Compare the number and type (X or Y) of sex chromosomes found in female and male flies.

Question: Compare the number of alleles present on the X and Y chromosomes.

Question: How can you tell that tan body is a sex-linked trait?

Question: How can you tell whether tan body is located on the X chromosome or the Y chromosome?

Question: If tan body was located on the Y-chromosome, what would be the phenotype of all the male F1 offspring? Is this what you obtained for the cross above?

Question: If tan body was located on the Y-chromosome, could females even show the trait? (HINT: When analyzing the cross results, remember that Y-linked traits are passed down only from affected males to their sons. Females cannot display Y-linked traits since they do not have Y chromosomes. On the other hand, both males and females can inherit X-linked traits since they both have X chromosomes.)

PUNNETT SQUARE:

List the genotypes of the parent flies in this cross (HINT: You must use X and Y symbols):

List the gametes produced by each parent fly in this cross:

Show the Punnett Square for the above cross.

Complete the following paragraph to learn about x-linked inheritance. expressed, men, sex-linked, ... Question: Complete the following paragraph to learn about X-linked inheritance. expressed, men, sex-linked,... Complete the following paragraph to learn about X-linked inheritance. expressed, men, sex-linked, repressed, X, Y, autosomal, two, one Sex-linked alleles have a different pattern of inheritance compared to those found on ____________ chromosomes. This is because on ____________ alleles, the allele is only carried on the X chromosome and not the Y chromosome. That means that females can pass down diseased alleles to offspring through ____________ ____________ chromosomes, while males can pass down alleles through ____________ ____________ chromosome. For this reason, it is more likely that ____________ are afflicted with sex-linked diseases, because whatever allele is carried on their ____________ ____________ chromosome is ____________ .

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