Penetrance In a certain breed of plants, thorns are determined by the dominant allele T and thornless is determined by the recessive allele t. T is 60% penetrant in the heterozygote; 40% of heterozygotes will appear thornless. If you make the parental cross TT x tt; what would be the expected number of progeny for each phenotype in a population of 400 F2 plants?

The Thorn plants will be about 300 while the thornless plants will be about 100.

Explanation:

When the parents cross

TT x tt

F1; Tt, Tt,Tt, Tt.

Tt x Tt

F2;. TT, Tt, Tt, tt..

Phenotypic ratio; 3:1.

Hence,3/4* 400=300

1/4*. 400=100

i would go with b

cytokinesis occurs after telophase so that eliminates d

and the entire reason for cytokinesis is for cellular reproduction

1)

i))the process of preparing food by green plants in the presence of sunlight is called photosynthesis.

ii) leaf is the site for photosynthesis.

iii) it takes place as,

6h2o+6co2=c6h12o6+602