Some dioecious species have the XY genotype for male and XX...

Name: Problem 5, Chapter 38: Campbell Biology
Uploaded: 2020-10-21T16:56:12-08:00
Duration: 3 min 11 s
Channel: Stephanie Schmidt
Description: Some dioecious species have the XY genotype for male and XX for female. After double fertilization, what would be the genotypes of the embryos and endosperm nuclei? a. embryo XY/endosperm XXX or embryo XX/endosperm XXY b. embryo XX/endosperm XX or embryo XY/endosperm XY c. embryo XX/endosperm XXX or embryo XY/endosperm XYY d. embryo XX/endosperm XXX or embryo XY/endosperm XXY

Some dioecious species have the XY genotype for male and XX for female. After double fertilization, what would be the genotypes of the embryos and endosperm nuclei? a. embryo XY/endosperm XXX or embryo XX/endosperm XXY b. embryo XX/endosperm XX or embryo XY/endosperm XY c. embryo XX/endosperm XXX or embryo XY/endosperm XYY d. embryo XX/endosperm XXX or embryo XY/endosperm XXY

Some dioecious species have the XY genotype for male and XX for female. After double fertilization, what would be the genotypes of the embryos and endosperm nuclei?
a. embryo XY/endosperm XXX or embryo XX/endosperm XXY
b. embryo XX/endosperm XX or embryo XY/endosperm XY
c. embryo XX/endosperm XXX or embryo XY/endosperm XYY
d. embryo XX/endosperm XXX or embryo XY/endosperm XXY

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Key Concepts

Dioecious Species and Sex Determination

In dioecious species, where individuals are distinctly male or female, sex determination is frequently controlled by chromosomal differences such as XY in males and XX in females. The genetic contribution of the male gamete (sperm) is key in generating these differences in the embryo.

Endosperm Genotype Formation

The endosperm forms from the fusion of the sperm with two polar nuclei from the female gametophyte, typically resulting in a triploid set of chromosomes. This triploid tissue plays a crucial role in supplying nutrients to the embryo during seed development.

Embryo Genotype Formation

The embryo's genotype is the result of the fusion between the haploid egg and a haploid sperm, yielding a diploid zygote. In species with chromosomal sex determination, the type of sperm (carrying either an X or a Y chromosome) directly determines the embryo's sex.

Double Fertilization

Double fertilization is a distinctive process in flowering plants where one sperm cell fuses with the egg cell to form the diploid embryo, while a second sperm cell fuses with two polar nuclei to form the triploid endosperm, which nourishes the growing embryo.

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