Question

У томатів червоне забарвлення плодів і опушене стебло – домінантні ознаки, а жовте забарвлення плодів і неопушене стебло – рецесивні ознаки. В овочевому господарстві провели схрещування дигетерозиготних червоноплідних томатів з опушеним стеблом і жовтоплідних томатів, у яких неопушене стебло. Визначити фенотип одержаного потомства. Решите задачу

Answer 1

Ответ:

Дивись документ

Объяснение:

Аналіз одержаного потомства:

+фенотип 1:1:1:1, тобто 25% рослин з червоними плодами і опушеним стеблом, 25% рослин з червоними плодами і неопушеним стеблом, 25% рослин з жовтими плодами і опушеним стеблом і 25% рослин з жовтими плодами і неопушеним стеблом;

генотип 1:1:1:1, тобто по 25% різних генотипних класів.

Answer 2

Phenotype of the Offspring in Tomato Crossbreeding

In this problem, we are given two types of tomatoes: red-fruited tomatoes with hairy stems (dominant traits) and yellow-fruited tomatoes with non-hairy stems (recessive traits). We need to determine the phenotype of the offspring resulting from crossing heterozygous red-fruited tomatoes with hairy stems and yellow-fruited tomatoes with non-hairy stems.

To solve this problem, we need to understand the principles of inheritance and the concept of dominant and recessive traits. In genetics, dominant traits are expressed when at least one copy of the corresponding gene is present, while recessive traits are only expressed when both copies of the gene are recessive.

In this case, the red-fruited tomatoes with hairy stems have the genotype RrHh, where R represents the gene for red fruit color (dominant) and r represents the gene for yellow fruit color (recessive), while H represents the gene for hairy stems (dominant) and h represents the gene for non-hairy stems (recessive). The yellow-fruited tomatoes with non-hairy stems have the genotype rrhh.

When these two types of tomatoes are crossed, the possible gametes produced by the red-fruited tomatoes with hairy stems are RH, Rh, rH, and rh, while the possible gametes produced by the yellow-fruited tomatoes with non-hairy stems are rh.

To determine the phenotype of the offspring, we need to consider the combination of alleles inherited from each parent. Let's analyze the possible genotypes and phenotypes of the offspring:

1. RH: This genotype represents red-fruited tomatoes with hairy stems. The dominant alleles for both traits are present, so the phenotype will be red-fruited tomatoes with hairy stems.

2. Rh: This genotype also represents red-fruited tomatoes with hairy stems. The dominant allele for red fruit color is present, so the phenotype will be red-fruited tomatoes with hairy stems.

3. rH: This genotype represents red-fruited tomatoes with non-hairy stems. The dominant allele for red fruit color is present, so the phenotype will be red-fruited tomatoes with non-hairy stems.

4. rh: This genotype represents yellow-fruited tomatoes with non-hairy stems. Both traits have recessive alleles, so the phenotype will be yellow-fruited tomatoes with non-hairy stems.

Based on the possible genotypes and phenotypes, the offspring resulting from crossing the heterozygous red-fruited tomatoes with hairy stems and yellow-fruited tomatoes with non-hairy stems will have a mixture of red-fruited tomatoes with hairy stems, red-fruited tomatoes with non-hairy stems, and yellow-fruited tomatoes with non-hairy stems.

Please note that this explanation is based on the principles of Mendelian genetics and assumes that the traits are controlled by a single gene with two alleles. In reality, the inheritance of traits can be more complex, involving multiple genes and environmental factors.

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