Question

Задача на моногибридное скрещевание . прошу помогите! 5. У овса ранняя спелость доминирует над поздней. На опытном участке от скрещивания позднеспелого овса с гибридом F1 получено 59789 раннеспелых растений. Сколько примерно позднеспелых растений выросло на опытном участке?

Answer 1

Monohybrid Cross Problem: Early Maturity Dominance

To solve this monohybrid cross problem, we need to determine the approximate number of late-maturing plants that grew on the experimental plot.

Given: - Early maturity (E) is dominant over late maturity (e). - 59,789 early-maturing plants were obtained from crossing a late-maturing oat plant with an F1 hybrid.

To find the approximate number of late-maturing plants, we can use the concept of Punnett squares and the principles of Mendelian genetics.

Mendelian Genetics and Punnett Squares

In Mendelian genetics, the Punnett square is a useful tool for predicting the possible outcomes of a genetic cross. It allows us to determine the genotypes and phenotypes of the offspring based on the genotypes of the parents.

In this case, we are dealing with a monohybrid cross, which involves the inheritance of a single trait. The trait in question is the maturity of the oat plants, with early maturity being dominant (E) and late maturity being recessive (e).

Determining the Genotypes of the Parents

Let's assign the genotypes of the parents as follows: - Late-maturing oat plant: ee - F1 hybrid: Ee

Since early maturity (E) is dominant over late maturity (e), the F1 hybrid will exhibit the early-maturing phenotype.

Constructing the Punnett Square

To determine the possible genotypes and phenotypes of the offspring, we can construct a Punnett square using the genotypes of the parents.

       |  e       e
   -----------------
   E | Ee      Ee
   -----------------
   e | Ee      Ee

Analyzing the Punnett Square

From the Punnett square, we can see that there are four possible genotypes for the offspring: Ee, Ee, Ee, and Ee. All of these genotypes will result in the early-maturing phenotype.

Calculating the Number of Late-Maturing Plants

Since all the offspring from the cross will exhibit the early-maturing phenotype, we can conclude that there were no late-maturing plants among the 59,789 plants obtained from the cross.

Therefore, the approximate number of late-maturing plants that grew on the experimental plot is 0.

Please note that this is an approximate calculation based on the assumption that the observed ratio of early-maturing plants to late-maturing plants follows Mendelian inheritance patterns. Other factors, such as genetic variations and environmental influences, may affect the actual results.

I hope this helps! Let me know if you have any further questions.