Question

У помідорів нормальна довжина стебла і червоний колір плодів-домінантні ознаки,а карликовість і жовтоплідність-рецесивні.а)Які ознаки матимуть гібриди,одержані внаслідок запилення гомозиготних червоноплідних рослин з нормальним стеблом пилком жовтоплідних карликових?б)Яким буде потомство від схрещування цих гібридів?в)Яке потомство одержать від схрещувань гібридів F1 з карликовими жовтоплідними рослинами?

Answer 1

А- червоне

а- жовте

В - нормальна довжина

в - карликовість

а) ААВВ х аавв

всі нащадки будуть дигетерозиготи АаВв

б) схрестивши ці гібриди АаВв х АаВв

буде червоні з нормальною довжиною стебла ААВВ, АаВВ, ААВв, АаВв

жовті з нормальною довжиною ааВв, ааВВ

червоні карликові Аавв, ААвв

жовті карликі аавв

в) АаВв х аавв

Нащадки: АаВв, Аавв, ааВв, аавв

Answer 2

Hybridization of Tomato Plants

When it comes to the characteristics of tomato plants, the length of the stem and the color of the fruits are considered dominant traits, while dwarfness and yellow fruit color are considered recessive traits.

a) Hybrids obtained from the cross between homozygous red-fruited plants with normal stems and yellow-fruited dwarf plants with normal pollen: The resulting hybrids will have one dominant allele for red fruit color and one recessive allele for yellow fruit color. They will also have one dominant allele for normal stem length and one recessive allele for dwarfness. Therefore, the hybrids will have a normal stem length and red fruit color as dominant traits, while dwarfness and yellow fruit color will be recessive traits.

b) Offspring from the cross between these hybrids: The offspring from the cross between these hybrids will have a genotype that consists of one dominant allele for red fruit color and one recessive allele for yellow fruit color, as well as one dominant allele for normal stem length and one recessive allele for dwarfness. Therefore, the offspring will have a normal stem length and red fruit color as dominant traits, while dwarfness and yellow fruit color will be recessive traits.

c) Offspring from the cross between F1 hybrids with dwarf yellow-fruited plants: The F1 hybrids obtained from the cross between red-fruited plants with normal stems and yellow-fruited dwarf plants will have a genotype consisting of one dominant allele for red fruit color and one recessive allele for yellow fruit color, as well as one dominant allele for normal stem length and one recessive allele for dwarfness. When these F1 hybrids are crossed with dwarf yellow-fruited plants, the resulting offspring will have a genotype that consists of one dominant allele for red fruit color and one recessive allele for yellow fruit color, as well as two recessive alleles for dwarfness. Therefore, the offspring will have a normal stem length and red fruit color as dominant traits, while dwarfness and yellow fruit color will be recessive traits.

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