What does SU VAR refer to?

Su(var) genes regulate the balance between euchromatin and heterochromatin in Drosophila. Genes Dev. 2004 Dec 1;18(23):2973-83. doi: 10.1101/gad. 323004.

Why is homozygous lethal?

A pair of identical alleles that are both present in an organism that ultimately results in death of that organism are referred to as recessive lethal alleles. Though recessive lethals may code for dominant or recessive traits, they are only fatal in the homozygous condition.

Why is Drosophila a model organism?

Due to their small size and minimal requirements, many Drosophila can be raised and tested within a small laboratory which does not have access time, space or funding. Genetic factors also make this fly an ideal model organism. D. melanogaster only has four pairs of chromosomes compared to 23 pairs in humans.

Why use Drosophila?

There are many technical advantages of using Drosophila over vertebrate models; they are easy and inexpensive to culture in laboratory conditions, have a much shorter life cycle, they produce large numbers of externally laid embryos and they can be genetically modified in numerous ways.

What is the most common genetic disorder among white Americans?

Cystic fibrosis is one of the most common genetic disorders in white people in the United States, occurring in one of every 3,200 live births. It is less common in African Americans (1 in 17,000), Asian Americans (1 in 31,000) and Native Americans.

What is the Dihybrid phenotypic ratio for recessive epistasis in an f2 generation?

9: 3: 4.

Why Drosophila is suitable for genetic research?

Drosophila have ‘polytene’ chromosomes, which means that they are oversized and have barcode-like banding patterns of light and dark. During early Drosophila research scientists could therefore easily identify chromosomal? rearrangements and deletions under the microscope.

How are Drosophila similar to humans?

That’s because, despite looking remarkably dissimilar to us, Drosophila have much the same fundamental biological make-up as humans. Significantly for medical scientists, they share 75% of the genes that cause disease in the human population. Drosophila are not hard to raise in huge numbers.

What ethnicity is most likely to get cystic fibrosis?

The cystic fibrosis gene is most common in Caucasians of northern European descent. The disease occurs most frequently in these people, but can occur in any ethnic population. Parents can be tested to see if they are carriers; however, it’s not possible to identify every person who carries a gene for cystic fibrosis.

How many phenotypic classes are produced by a Dihybrid test cross where one parent is heterozygous for both pairs of genes?

So, the correct option is ‘2’.