AP BIOLOGY

CELL DIVISION

MEIOSIS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Body cells of fruit flies contain 8 chromosomes. Scientists used studies of flies to discover how egg and sperm are formed. What did they observe?
A
Body cell of offspring flies have 16 chromosomes.
B
Sperm cells have 8 chromosomes.
C
Egg cells have 4 chromosomes.
D
Body cells of offspring have 4 chromosomes.
Explanation: 

Detailed explanation-1: -What did they observe? Body cell of offspring flies have 16 chromosomes. Sperm cells have 8 chromosomes.

Detailed explanation-2: -The reproductive cells, representing the sperm and egg, are haploid and the unfertilized egg of fruit flies contains 4 chromosomes.

Detailed explanation-3: -There are three autosomes in a fruit fly sperm cell. Sperm cells are haploid, meaning they only have one copy of each chromosome. Fruit fly body cells have eight chromosomes, two pairs of each of three autosomes and two sex chromosomes.

Detailed explanation-4: -Each daughter cell will have 8 chromosomes. That is correct. By the end of mitosis, there are two daughter cells. Each daughter cell will have the same amount of genetic material as the parent – 8 chromosomes.

Detailed explanation-5: -Chromosome Number A body cell in an adult fruit fly has 8 chromosomes: 4 from the fruit fly’s male parent, and 4 from its female parent. These sets of chromosomes are homologous. Each of the 4 chromosomes that came from the male parent has a corresponding chromosome from the female parent.

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