In tigers, a recessive allele that is pleiotropic causes an absence of fur pigmentation (a white tiger) and a cross-eyed condition. if two phenotypically normal tigers that are heterozygous at this locus are mated, what percentage of their offspring will be cross-eyed? what percentage of cross-eyed tigers will be white?

percentage of their offspring with cross-eye %

Percentage of cross-eyed tigers with white fur out of the cross eyed tigers%

Explanation:

Let the recessive allele representing the “white fur” trait in tigers be “w”

Allele representing the “pigmented fur” trait in tigers be “W”

Similarly recessive allele representing the “crossed eye” trait in tigers be “c” and “normal eye” trait in tigers be “C”

Two heterozygous normal tigers will have genotype – WwCc

A punnet square representing cross between two tigers with genotype “WwCc” is as follows –

WC         Wc         wC          wc

WCWWCCWWCcWwCCWwCc

WcWWCcWWccWwCcWwcc

wCWwCCWwCcWwCCwwCc

wcWwCcWwccwwCcwwcc

Genotype of Tiger with cross eyes are – WWcc, Wwcc, Wwcc, wwcc

Number of tigers with cross eyed 4

percentage of their offspring with cross-eye

%

Percentage of cross-eyed tigers with white fur out of the cross eyed tigers

%

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation:

one is through turgidity. this occurs before ground tissue ( collenchyma

and sclerenchyma cells) become well

developed to give structural support to the plant as it grows bigger. the xylem

tissue (composed of rigid tissue) of the young

plant render this support and also maintaining osmotic turgidity of the surrounding

plant cells.