In drosophila, Physical forces drive invagination of the ventral furrow. Following statements regarding to this process:

A. The cellularized blastoderm will begin to activate higher levels of myosin in the cells at the ventral midline and preferentially at their apical surface.

B. Epithelial adhesions paired with differential activation of dynein and tissue geometry create mechanical constraints that affect the orientation of actomyosin meshworks.

C. The A/P oriented arrays of myosin in the cells at the ventral midline generate tension along the anterior-posterior axis.

D. The combination of tissue geometry and tension of these anterior-to-posterior meshworks cause the tissue to fold outward at a right angle to the anterior-posterior axis, creating a long and narrow ventral furrow.

Which of the following statements are incorrect?

#Question id: 5431

#Unit 8. Inheritance Biology

Plant having height 6 cm are allowed to cross with plant having height 2 cm , all F1 progeny having height uniform 4 cm were allowed selfing to produced F2 progeny in which 3 plant out of  8 having height  4 cm . what are number of polygene involve in that trait ?

#Question id: 5432

#Unit 8. Inheritance Biology

which of the following are not feature of polygenic inheritance ?

#Question id: 5433

#Unit 8. Inheritance Biology

Two varieties of maize averaging 120 and 80 inches in height, respectively, are crossed. The F1 progeny is quite uniform averaging 100 inches in height. If height is control by 3 pair of polygene, what is proportional of averaging phenotype in their F2 progeny?

#Question id: 5434

#Unit 8. Inheritance Biology

Plant height of wild Solanum nigrum is controlled by polygene. A pure line plant with 60 cm height was cross to pure line plant having 20 cm height .All F1 plant having uniform height 40 cm. F1 plant was allowed to self-fertilization to produced 4/64 proportional of F2 plant having height 20 cm . What is number of polygene governing plant height?

#Question id: 5435

#Unit 8. Inheritance Biology

A polygenic trait is controlled by three genes-A, B and C. In a cross, AaBbCc x AaBbCc, what is a probability of intermediate phenotype offspring?

#Question id: 5436

#Unit 8. Inheritance Biology

Quantitative characteristics arise from two phenomena either polygenic or environmental influence on genotype. Which of the following is not character of quantitative polygenic trait?