Genetics: Mapping and Recombinant Frequency

• Biology
• shawonna23
In summary, the cross between two homozygous plants resulted in all yellow, long-stemmed offspring (F1). The F2 generation had 1,263 yellow, long-stemmed offspring and 1,196 white, short-stemmed offspring. Additionally, there were 205 yellow, short-stemmed offspring and 195 white, long-stemmed offspring in the F2 generation. By calculating the recombinant frequency, it can be determined that the genes involved in the cross are linked and 14 map units apart.
shawonna23

Homework Statement

Two homozygous plants are crossed and all offspring (F1) are yellow with long stems. A cross of the offspring (F1)produces the following phenotypes in the F2 generation:

1,263 yellow, long stem
1,196 white, short stem
205 yellow, short stem
195 white, long stem

What information can be determined about the genes involved in the cross?

a. The genes are linked and are 14 map units apart.
b. The genes are linked but you can tell how far apart they are from each other.
c. The genes are linked and are 7 map units apart.
d. The genes are not linked.

The Attempt at a Solution

1263 and 1196 are the parental type

205 and 195 are the recombinant offspring

Recombinant frequency= (205+195) / (1263+1196) * 100= 14%

the genes are linked and are 14 map units apart

Are you sure only the # of parental's goes in the denominator? Be careful.

Thanks...i actually forgot to put all of the progeny in the denominator...(205+195+1263+1196)

1. What is genetic mapping and how is it used?

Genetic mapping is the process of determining the locations of specific genes on a chromosome. It is used to understand the genetic basis of inherited traits and diseases, as well as to identify potential targets for genetic therapies.

2. What is recombinant frequency and how is it calculated?

Recombinant frequency is the percentage of offspring that show a recombination (exchange of genetic material) between two specific genes during meiosis. It is calculated by dividing the number of recombinant offspring by the total number of offspring and multiplying by 100.

3. How is genetic mapping and recombinant frequency related?

Genetic mapping and recombinant frequency are closely related because they both involve studying the inheritance patterns of genes. Genetic mapping can help determine the order and distance between genes on a chromosome, which in turn can be used to calculate recombinant frequency.

4. What are some techniques used in genetic mapping?

Some common techniques used in genetic mapping include linkage analysis, association mapping, and physical mapping. These techniques involve studying patterns of inheritance, genetic markers, and physical locations of genes on a chromosome.

5. How does genetic mapping contribute to our understanding of human health and disease?

Genetic mapping plays a crucial role in understanding the genetic basis of human health and disease. It allows us to identify genes that may be linked to certain diseases or traits, as well as potential targets for treatments or interventions. It also helps us better understand the complex interactions between genes and the environment that contribute to our overall health and well-being.

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