In the cross bb x bb, the percent of offspring in the f1 generation that will have the same genotype as one of their parents is
100%
50%
25%
0%

0%

Explanation:

This is a typical monohybrid cross involving a single gene B.

Both parents are purebreeding or homozygous i.e. have identical alleles for the specified trait. Hence, in a cross between the two, all the offsprings will be heterozygous (Bb) i.e. possess different alleles for the trait (See attached image).

N.B: A genotype is the genetical make up of an organism.

Since the genotypes of all the possible offsprings will be Bb, there is none that will possess the same genotype as any of the parent. Hence, the percentage is 0% i.e. 0/4 × 100

fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

explanation:

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