Question

Даю 15 баллов!! 3. Решите задачу. У флоксов белая окраска венчика доминирует над розовой. Скрестили гетерозиготное растение с белыми цветками и растение с розовыми цветками и получили 96 гибридов. а) Сколько типов гамет образует растение с розовыми цветками? б) Сколько растений с розовыми цветками будет в F1? в) Сколько разных генотипов будет в F1? г) Сколько разных фенотипов будет в F1? д) Сколько растений с белыми цветками будет в F1?

Answer 1

Ответ=AA,Aa,Aa,aa
по типу гамет то два гетерозиготных белых Aa ,и один гомозиготный белыйa AA ,и гомозиготный розовый aa .
a)один тип гамет с розовами цветками aa
в)4 разных геннотипа 1:2:1
по фенотипу 3:1 

Answer 2

Task Analysis

To solve this problem, we need to understand the principles of Mendelian genetics and the inheritance patterns of traits. We are given that white color is dominant over pink in the flowers of phlox plants. We also know that a heterozygous plant with white flowers was crossed with a plant with pink flowers, resulting in 96 hybrids. We need to determine the number of gamete types produced by the plant with pink flowers, the number of plants with pink flowers in the F1 generation, the number of different genotypes in the F1 generation, the number of different phenotypes in the F1 generation, and the number of plants with white flowers in the F1 generation.

Solution

a) To determine the number of gamete types produced by the plant with pink flowers, we need to consider the genotype of the plant. Since the plant with pink flowers is homozygous recessive (pp), it can only produce one type of gamete carrying the recessive allele (p). Therefore, the plant with pink flowers will produce one type of gamete.

b) To determine the number of plants with pink flowers in the F1 generation, we need to consider the possible genotypes resulting from the cross. The heterozygous plant with white flowers can produce two types of gametes, carrying either the dominant allele (P) or the recessive allele (p). The plant with pink flowers can only produce one type of gamete carrying the recessive allele (p). When these gametes combine, the possible genotypes in the F1 generation are PP (white flowers) and Pp (white flowers). Therefore, all the plants in the F1 generation will have white flowers.

c) To determine the number of different genotypes in the F1 generation, we need to consider the possible combinations of alleles from the parent plants. The heterozygous plant with white flowers can produce two types of gametes (P and p), and the plant with pink flowers can produce one type of gamete (p). When these gametes combine, the possible genotypes in the F1 generation are PP (white flowers) and Pp (white flowers). Therefore, there are two different genotypes in the F1 generation.

d) To determine the number of different phenotypes in the F1 generation, we need to consider the expression of the dominant and recessive alleles. Since white color is dominant over pink, both genotypes (PP and Pp) will exhibit the white phenotype. Therefore, there is only one phenotype (white flowers) in the F1 generation.

e) To determine the number of plants with white flowers in the F1 generation, we need to consider the possible genotypes resulting from the cross. The heterozygous plant with white flowers can produce two types of gametes, carrying either the dominant allele (P) or the recessive allele (p). The plant with pink flowers can only produce one type of gamete carrying the recessive allele (p). When these gametes combine, the possible genotypes in the F1 generation are PP (white flowers) and Pp (white flowers). Therefore, all the plants in the F1 generation will have white flowers.

In summary: a) The plant with pink flowers will produce one type of gamete. b) All the plants in the F1 generation will have white flowers. c) There are two different genotypes in the F1 generation. d) There is only one phenotype (white flowers) in the F1 generation. e) All the plants in the F1 generation will have white flowers.

Please let me know if anything is unclear or if you have any further questions!