Brainliest asap! someone me : ) in one type of dog, black spots (b) are dominant over brown spots (b) and long tails (l) are dominant over short tails (l). complete a dihybrid cross for parents with the genotypes: bbll × bbll and answer the following in complete sentences. 1. describe how you would set up a punnett square for this cross. 2. list the likelihood of each possible offspring genotype. 3. list the likelihood of each possible offspring phenotype.

a)

Punnet square

BL         bL         BL           bL

BLBBLLBbLLBBLLBbLL

BlBBLlBbLlBBLlBbLl

BLBBLLBbLLBBLLBbLL

BlBBLlBbLlBBLlBbLl

b) Possible genotypes are

BBLL- 5

BbLL-5

BBLl-5

BbLl-5

c) Possible phenotype

Black spot and long tail - %

Explanation:

Given

a) black spots (B) are dominant over brown spots (b)

b) Long tails (L) are dominant over short tails (l)

A cross is carried out between BbLL × BBLl

Allele for BbLL are BL, bL, BL, bL

Allele for BBLl are BL, Bl, BL, Bl

1. Punnet square

BL         bL         BL           bL

BLBBLLBbLLBBLLBbLL

BlBBLlBbLlBBLlBbLl

BLBBLLBbLLBBLLBbLL

BlBBLlBbLlBBLlBbLl

2. Possible genotypes are

BBLL- 4

BbLL-4

BBLl-4

BbLl-4

Thus, out of total 16 possible offspring each genotype occurs four times. Thus the likelihood of each genotype is

%

2. Possible phenotype

BBLL- Black spot Long tail

BbLL-Black spot Long tail

BBLl-Black spot Long tail

BbLl-Black spot Long tail

All the 16 offspring have Black spot and long tail.

Thus the likelihood of offspring with Black spot and long tail is %

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: