1.A mutation leads to death of developing Drosophila flies as early embryos beca
ID: 172803 • Letter: 1
Question
1.A mutation leads to death of developing Drosophila flies as early embryos because the abdomen and part of the thorax are missing. This mutation is recessive, and its phenotype is due solely to the genotype of the individual possessing it. This is most likely a mutation in a _______ gene.
a) maternal effect
b) pair ruleHox
c) segment polaritygap
2. Caspases in mammals, which are similar to _______ in nematodes, are involved in _______.
a) CED-3; apoptosis
b) LIN-3; establishing the identity of segments
c) LIN-3; apoptosis
3. A cell line has the ability to become most cell types, but it cannot form an embryo. It is thus
a) pluripotent.
b) unipotent
c) totipotent
2. Caspases in mammals, which are similar to _______ in nematodes, are involved in _______.
a) CED-3; apoptosis
b) LIN-3; establishing the identity of segments
c) LIN-3; apoptosis
3. A cell line has the ability to become most cell types, but it cannot form an embryo. It is thus
a) pluripotent.
b) unipotent
c) totipotent
a) CED-3; apoptosis
b) LIN-3; establishing the identity of segments
c) LIN-3; apoptosis
3. A cell line has the ability to become most cell types, but it cannot form an embryo. It is thus
a) pluripotent.
b) unipotent
c) totipotent
Explanation / Answer
1. For the first question answer is mutation in the maternal effect gene which leads to death of drosophila because the abdomen and part of thorax are missing.
Maternal effect gene is responsible for thorax and abdomen formation in drosophila.
2. Caspases in mammals are similar to CED-3 protease of nematodes which are involved in the programmed cell death called CED-3 Apoptosis. It is useful in maintaining homeostasis.
So answer is option a.
3. A cell line has the ability to become most cell types, but it can not form an embryo. It is thus pluripotent. Hence the option is a.
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