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Which statement accurately describes the degree of linkage between pairs of genes on the same chromosome?

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Different pairs of genes on the same chromosome will exhibit different degrees of linkage, and some will assort independently.


All possible pairs of genes located on the same chromosome will exhibit linkage to the same degree.


All possible pairs of genes located on the same chromosome will exhibit linkage, although the degree of linkage will vary between different pairs.


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1. **Different pairs of genes on the same chromosome will exhibit different degrees of linkage, and some will assort independently.**

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You are performing a cross involving two X-linked genes in Drosophila. Almost 98% of the males in the F2 generation are either w+ y / Y or w y+ / Y. What was the most likely genotype of the F1 females?

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w y / w+ y


w+ y / w y+


w y / w y


w+ y+ / w y


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2. **w+ y / w y+**

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Based on Mendel's law of independent assortment, what phenotypic ratio should the offspring of a two-factor cross between two dihybrids show, assuming that the two genes control different traits?

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1:1:1:1


12:3:1


7:4:4:3


9:3:3:1


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4. **9:3:3:1**

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A typical human chromosome carries hundreds of 
.


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genes.

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A scientist performs a dihybrid cross between two true-breeding pea plants. In the  F2
  generation, there is an increase in the proportion of the two parental classes (9/16 and 1/16) at the expense of the two recombinant classes (the two 3/16 classes). This indicates that the two genes in this dihybrid cross are Blank______.

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independently assorting


on the X chromosome


linked


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3. **linked**

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When two genes do not assort independently, a dihybrid produces more parental than recombinant gamete types, and the genes are said to be ________.

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autosomal


linked


hybrids


mutant


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2. **linked**

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Using a testcross, geneticists can analyze gene recombination by crossing an individual that is homozygous for the 
 alleles of two genes with a doubly 
 individual.


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Using a testcross, geneticists can analyze gene recombination by crossing an individual that is homozygous for the **recessive** alleles of two genes with a doubly **heterozygous** individual.

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A 2-part illustration shows 2 cross series labeled A and B.
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The results of the cross depicted in the image suggest that the white and yellow genes are linked. How would the results vary if the genes were independently assorting?

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The ratio of male flies with parental genotypes to male flies with recombinant genotypes would be roughly 3:1.


The number of male flies with recombinant genotypes would exceed the number of male flies with parental genotypes.


The number of male flies with recombinant genotypes and the number of male flies with parental genotypes will be roughly equal.


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3. **The number of male flies with recombinant genotypes and the number of male flies with parental genotypes will be roughly equal.**

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In a testcross, if the genes in question are linked, how does the number of recombinant offspring relate to the number of parental offspring?

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There are equal numbers of recombinant and parental offspring.


There are fewer recombinant offspring than parental offspring.


There are more recombinant offspring than parental offspring.


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2. **There are fewer recombinant offspring than parental offspring.**

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Suppose you are studying two different pairs of genes on the X chromosome of Drosophila. The two pairs of genes Blank______.

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will assort independently which is typical of most pairs of genes on the X chromosome


will exhibit the same characteristic degree of linkage (typical for all genes located on the X chromosome)


could exhibit different degrees of linkage or could assort independently


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3. **could exhibit different degrees of linkage or could assort independently**