AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

THE HUMAN GENOME

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A human egg cell might contain (3.2.1)
A
22 autosomes and an X chromosome
B
22 autosomes and a Y chromosome
C
45 autosomes and an X chromosome
D
45 autosomes and a Y chromosome
Explanation: 

Detailed explanation-1: -Egg cells are haploid gametes of females, which means they have one-half set of chromosomes. Thus, they have 22 autosomes and an X-chromosome for a total of 23 chromosomes total, half of the 46 chromosomes in a complete somatic cell.

Detailed explanation-2: -Each sperm cell contains 23 chromosomes : 22 autosomes and one sex chromosome X or Y.

Detailed explanation-3: -Human sperm (and eggs) are in the haploid state, meaning that only have one copy of each chromosome, or 22 autosomes and one sex chromosome (either X or Y).

Detailed explanation-4: -A diploid cell has two complete sets of chromosomes. Most cells in humans are diploid, comprising 23 chromosome pairs, so 46 chromosomes in total. This is 22 pairs of autosomes and a pair of sex chromosomes.

Detailed explanation-5: -Definition. Containing one copy of each chromosome. Human gametes (egg and sperm cells) are haploid, containing 22 autosomes and one sex chromosome.

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