Genetics And Plant Breeding - Study Mode

[#746] How many gamets can be produced by an organism having the genotype-AaBBCcdd?
Correct Answer

(B) 16

Explanation

Solution: 16 gametes can be produced by an organism having the genotype-AaBBCcdd. The total number of gametes produced by an organism = 2 n . Where n= number of genes for which the organism is heterozygous. Here, in the given genotype-AaBBCcdd is heterozygous for 4 genes. Therefore, no. of gametes = 2 n = 2 4 = 16.

[#747] Mitosis was discovered by
Correct Answer

(A) Flemming

Explanation

Solution: Mitosis was discovered by Flemming. Walther Flemming was a German biologist and a founder of cytogenetics. Flemming investigated the process of cell division and the distribution of chromosomes to the daughter nuclei, a process he called mitosis from the Greek word for thread. However, he did not see the splitting into identical halves, the daughter chromatids. He studied mitosis both in vivo and in stained preparations, using as the source of biological material the fins and gills of salamanders. Flemming's name is honoured by a medal awarded by the German Society for Cell Biology.

[#748] The theory of Natural Selection was put forward in
Correct Answer

(B) 1859

Explanation

Solution: The theory of Natural Selection was put forward in 1859. In 1859, Charles Darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. He defined natural selection as the "principle by which each slight variation, if useful, is preserved". The concept was simple but powerful: individuals best adapted to their environments are more likely to survive and reproduce.

[#749] Grow out test is done for
Correct Answer

(D) Purity

Explanation

Solution: Grow out test is done for Purity. Grow out test is a test that is conducted to determine the genetic purity of given seed lots. Genetic purity of seeds refers to the trueness to type. If the seed possesses all the genetic qualities that the breeder has placed in the variety, it is said to be genetically pure.

[#750] Generally the mutations have
Correct Answer

(D) Both A and B

Explanation

Solution: Generally the mutations have both Lethal and Deleterious effects. Mutational effects can be beneficial, harmful, or neutral, depending on their context or location. Most non-neutral mutations are deleterious. In general, the more base pairs that are affected by a mutation, the larger the effect of the mutation, and the larger the mutation's probability of being deleterious.