Respan Dataset Explorer

McGraw Hill
Skip to Main Content
Reading Mode

2 of 58 Concepts completed
Question Mode
An illustration shows a cross series labeled from A to D.
Text Alternative
Multiple Choice Question
On this diagram that summarizes a cross between Drosophila flies following two X-linked traits, which letters represent the recombinant offspring?

Multiple choice question.

A and B


C and D


A and C


A and D


B and C


Need help? Review these concept resources.1 concept resource available.


Rate your confidence to submit your answer.
© 2025 McGraw Hill. All Rights Reserved.
Privacy Center opens in new window
Terms of Use opens in new window

To determine which letters represent the recombinant offspring in a cross involving two X-linked traits in Drosophila flies, we need to identify the parental combinations and the recombinant combinations.

Recombinant offspring are those that have combinations of traits that are different from either of the parental types. In most cases, this involves noticing which combinations of traits occur less frequently than the parental types, which typically occur together due to linkage.

If you can provide the specific traits associated with each letter (A, B, C, and D) in the illustration, I can help you determine which letters likely represent the recombinant offspring. Without that information, it would not be possible to provide a specific answer.

GoldbergHartwellGenetics8eFig53Pg123CrossB.jpg Text Alternative
The illustration shows the parents female (w plus y plus green) (w plus y plus green) and male (w y light green) producing F1 generation with the following genotypes: Female (w plus y plus green) (w y light green), and male (w plus y plus green). F2 generation produced by the F1 generation shows males as follows: w plus y plus green labeled A; w y light green labeled B; w plus y half green and half light green labeled C, and w y plus half light green half green labeled D.

Given the information about the genotypes from the cross involving Drosophila flies, we can analyze the offspring:

- **Parents:**
  - Female: \( \text{w}^+ \text{y}^+ \text{green} \)
  - Male: \( \text{w} \text{y} \text{light green} \)

- **F1 Generation:**
  - Female: \( \text{w}^+ \text{y}^+ \text{green} \) (homozygous from the female parent) 
  - Male: \( \text{w}^+ \text{y}^+ \text{green} \) (from the male parent)

- **F2 Generation:**
  - Males:
    - A: \( \text{w}^+ \text{y}^+ \text{green} \) (parental type)
    - B: \( \text{w} \text{y} \text{light green} \) (parental type)
    - C: \( \text{w} \text{y}^+ \) (recombinant type, since it has a combination not seen in either parent)
    - D: \( \text{w}^+ \text{y} \) (recombinant type, as it also differs from the parental combinations)

### Conclusion:
The recombinant offspring are the ones that have unique combinations of alleles not present in the parental types. Therefore, the letters that represent the recombinant offspring are **C and D**.

So, the correct answer is **C and D**.

McGraw Hill
Skip to Main Content
Reading Mode

2 of 58 Concepts completed
Question Mode
Multiple Choice Question
How many genes does a typical human chromosome contain?

Multiple choice question.

Less than one hundred


Several million


Tens of thousands


Many hundreds


Need help? Review these concept resources.1 concept resource available.


Rate your confidence to submit your answer.
© 2025 McGraw Hill. All Rights Reserved.
Privacy Center opens in new window
Terms of Use opens in new window
Question Mode. Multiple Choice Question

A typical human chromosome contains **tens of thousands** of genes. While the exact number can vary, estimates suggest that there are about 20,000 to 25,000 protein-coding genes in the human genome. Given that chromosomes consist of both coding and non-coding regions, the most accurate choice from your options is:

**Tens of thousands.**

i just want the answer not the explanation

Tens of thousands.

also if its multipl echoice just give the option such as 1,2,3,4

3. Tens of thousands.

McGraw Hill
Skip to Main Content
Reading Mode

2 of 58 Concepts completed
Question Mode
Multiple Choice Question
Because bacterial cells contain one large circular chromosome, all genes within that chromosome are _blank_.

Multiple choice question.

homologous


syntenic


recombinant


nonhomologous


Need help? Review these concept resources.1 concept resource available.


Rate your confidence to submit your answer.
© 2025 McGraw Hill. All Rights Reserved.
Privacy Center opens in new window
Terms of Use opens in new window
Question Mode. Multiple Choice Question

2. syntenic.

McGraw Hill
Skip to Main Content
Reading Mode

3 of 58 Concepts completed
Question Mode
Fill in the Blank Question
Fill in the blank question.
Two genes are considered to be 
 when a dihybrid produces more parental gamete types than recombinant gamete types.


Need help? Review these concept resources.1 concept resource available.


Rate your confidence to submit your answer.
© 2025 McGraw Hill. All Rights Reserved.
Privacy Center opens in new window
Terms of Use opens in new window
Question Mode. Fill in the Blank Question

linked.

McGraw Hill
Skip to Main Content
Reading Mode

3 of 58 Concepts completed
Question Mode
Multiple Choice Question
In fruit flies, two of the X-linked white gene alleles are: w+, which specifies red eyes, and w, which confers white eyes. The w+ allele is dominant to the w allele. How would you specify a male with white eyes?

Multiple choice question.

w+ / Yw


wX / Y


w / w


w / Y


Need help? Review these concept resources.1 concept resource available.


Rate your confidence to submit your answer.
© 2025 McGraw Hill. All Rights Reserved.
Privacy Center opens in new window
Terms of Use opens in new window

4. **w / Y**

McGraw Hill
Skip to Main Content
Reading Mode

4 of 58 Concepts completed
Question Mode
A 2-part illustration shows 2 cross series labeled A and B.
Text Alternative
Multiple Choice Question
Based on the ratios between parental and recombinant offspring in the two crosses depicted on the image, you can tell that the white and yellow genes are _blank_.

Multiple choice question.

unlinked


linked


independently assorting


Need help? Review these concept resources.1 concept resource available.


Rate your confidence to submit your answer.
© 2025 McGraw Hill. All Rights Reserved.
Privacy Center opens in new window
Terms of Use opens in new window
Question Mode. Multiple Choice Question

2. **linked**

McGraw Hill
Skip to Main Content
Reading Mode

4 of 58 Concepts completed
Question Mode
Multiple Choice Question
A doubly heterozygous female fruit fly with the genotype w y+ / w+ y mates with a w+ y / Y male. Some of the offspring have a w y / Y genotype. These flies are of the _blank_.

Multiple choice question.

wild type


parental type


recombinant type


Need help? Review these concept resources.1 concept resource available.


Rate your confidence to submit your answer.
© 2025 McGraw Hill. All Rights Reserved.
Privacy Center opens in new window
Terms of Use opens in new window
Question Mode. Multiple Choice Question

3. **recombinant type**