☰ Contents · Biology (Cytology and genetics)

Basics of genetics and Mendel’s laws

Lessons 47–48 · 2 lessons · A. Zikiryayev, A. To‘xtayev, I. Azimov, N. Sonin. Biology. Basics of Cytology and Genetics, Grade 9, revised and expanded 5th edition. “Yangiyul Poligraph Service”, Tashkent, 2019
Answers are for parents and teachers.
1
What genotypes can a dominant-phenotype organism have and how can they be found out?
2
Aa × Aa produced 2000 plants. About how many show the dominant trait?
3
If pink four-o’clocks (Rr) are crossed, what is the phenotype ratio and why is it not 3:1?
4
Using yellow (A) and green (a) peas, write F2 of P: AA × aa in a Punnett square.
5
List the stages in the development of genetics.