18 Questions
What is the significance of autosomes in the sex determination of Drosophila?
Autosomes combine with X chromosomes to influence the development of male and female characteristics
What distinguishes sex-linked traits from autosomal traits in Drosophila?
Sex-linked traits are inherited differently and are located on sex chromosomes
What is the purpose of conducting reciprocal crosses in Drosophila genetics?
To determine if traits are linked on the X chromosome
How does non-disjunction provide support for the Chromosomal theory of inheritance?
Non-disjunction results in an abnormal number of chromosomes, leading to unexpected phenotypes
In Drosophila genetics, what are reciprocal crosses commonly used to investigate?
The inheritance pattern of specific traits and the linkage of genes
How do X chromosomes and autosomes collectively impact the development of male and female characteristics in Drosophila?
Both X chromosomes and autosomes collectively influence the development of male and female traits
What is the main difference between neutral petite mutations and suppressive petite mutations?
Neutral petite mutations lead to normal colonies, while suppressive petite mutations lead to all petite colonies.
In Drosophila, what is the role of maternal effect genes in early embryonic development?
Maternal effect genes control the cleavage pattern of the zygote.
How do nurse cells in snails contribute to embryonic development following fertilization?
Nurse cells transfer gene products, cytoplasm, and organelles to enrich the oocyte's cytoplasm.
How does maternal effect influence the phenotype of the developing zygote in Drosophila?
The zygote's phenotype is solely determined by the genotype of the mother.
What are the consequences of mutations in maternal effect genes in females in the next generation?
The next generation will exhibit abnormalities in body axis formation.
What aspect of development does Developmental Genetics primarily focus on?
Understanding how genes orchestrate changes during an organism's development.
What is the most crucial factor in determining the outcome of a cross involving linked genes?
Specific arrangement of alleles on homologous chromosomes
What is the significance of a recombination frequency of 50% between two genes?
The genes are unlinked
What is the relationship between the distance separating two genes and their recombination frequency?
Recombination frequency is inversely proportional to the distance
What is the characteristic of genes that have a recombination frequency less than 50%?
They are linked genes
What was observed in Cross A of dihybrid crosses for two linked genes in Drosophila studied by Thomas Hunt Morgan?
Mostly parental phenotypes with a small percentage of recombinant phenotypes
What is the characteristic of genes located on independent chromosomes or far apart on a single chromosome?
They are unlinked genes
Explore the contributions of Thomas H. Morgan in understanding sex determination in Drosophila, focusing on the role of X chromosomes, autosomes, and sex-linkage. Learn how the combination of these genetic factors influences the development of male and female characteristics in the fruit fly.
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