Question

У томатов круглая форма и красная окраска плодов доминантные признаки.Определите какое количество красных круглых плодов из общего урожая(48т) будет от скрещивания гетрозиготных растений.имеющих красные округлые плоды

Answer 1

120 растений.  ( Генетика. 10 класс. - Решение заданий - rideamus.com )

Answer 2

Dominant Traits in Tomatoes

Tomatoes have a round shape and red color as dominant traits. This means that if a tomato plant has the genes for round shape and red color, those traits will be expressed in the fruit it produces.

To determine the number of red, round fruits from a total yield of 48 tons (48,000 kilograms) resulting from the crossbreeding of heterozygous plants with red, round fruits, we need to consider the principles of Mendelian genetics.

According to Mendel's laws, when two heterozygous plants are crossed, each parent plant contributes one allele for each trait. In this case, the alleles for round shape and red color are dominant, denoted by capital letters (R for round shape and R for red color), while the alleles for non-round shape and non-red color are recessive, denoted by lowercase letters (r for non-round shape and r for non-red color).

When two heterozygous plants are crossed (Rr x Rr), the possible combinations of alleles in their offspring are as follows:

- RR (round shape, red color) - Rr (round shape, red color) - Rr (round shape, red color) - rr (non-round shape, non-red color)

Since the dominant traits (round shape and red color) are expressed in both the homozygous dominant (RR) and heterozygous (Rr) genotypes, the percentage of red, round fruits can be calculated by adding the frequencies of these two genotypes.

The frequency of the RR genotype can be determined using the formula:

Frequency of RR genotype = (Number of RR individuals / Total number of individuals) * 100

Similarly, the frequency of the Rr genotype can be determined using the same formula.

By knowing the frequencies of these genotypes, we can estimate the percentage of red, round fruits in the total yield.

Unfortunately, the search results provided by You.com do not contain specific information about the number of red, round fruits resulting from the crossbreeding of heterozygous plants. Therefore, we cannot provide an exact answer based on the available information.

If you have access to additional information or if you can provide more specific details about the crossbreeding experiment, I would be happy to assist you further.