Biology Practice: Genetics (Mock Test 5 - Ultimate Comprehensive Mastery)
1. The physical expression of a gene is called the phenotype, while the genetic makeup is the:
2. A cross between a tall pea plant and a dwarf pea plant results in all tall plants in $F_1$. This illustrates Mendel's:
3. Hemophilia is a sex-linked disease. If a hemophilic man marries a homozygous normal woman, the probability of their son being hemophilic is:
4. The nitrogenous base pair in DNA that is held together by two hydrogen bonds is:
5. Which of the following is an autosomal recessive trait in humans?
6. A dihybrid cross between $RRYY$ and $rryy$ produces $F_1$ generation. The phenotype of $F_1$ will be:
7. The sex-determination mechanism in humans is $XY$ type. Which parent is heterogametic?
8. A sudden change in one or more genes in an organism's progeny is called:
9. If a woman is color-blind ($X^c X^c$), all of her _____ will definitely be color-blind.
10. The sugar present in the DNA molecule is:
11. A monohybrid $F_2$ phenotypic ratio of 3:1 is a result of self-pollinating which genotype?
12. How many chromosomes are found in a human egg cell?
13. The structural and functional unit of heredity is the:
14. Which Law of Mendel is also known as the "Law of Purity of Gametes"?
15. The sex of a human baby is determined at the moment of:
16. The condition in which an individual has both $X$ and $Y$ chromosomes is:
17. Which nitrogenous base is NOT found in DNA but found in RNA?
18. A heterozygous tall pea plant ($Tt$) is crossed with a dwarf pea plant ($tt$). What is the ratio of offspring?
19. The number of chromosomes in the human body cells (autosomes) is:
20. DNA coiling around histone octamers forms a unit called: