The between a monohybrid cross and a dihybrid cross s that d

The between a monohybrid cross and a dihybrid cross s that dihybrid a. difference traits which only one allele exists, while monohybrid crosses involve for b. traits involve two alleles. self pollination, while dihybrid crosses involve monohybrid crosses involve c. cross-pollination. dihybrid crosses involve two traits. one. monohybrid crosses involve one trait need only d. dihybrid crosses require two Punnett squares; monohybrid crosses Which of the following is the best explanation for the observation that females rarely getthe disease a. Large quantities of male hormones are necessary in order for the allele carrying the disease to be expressed. the disease die before birth. b. fetuses that carry the allele for having a and a father A female could get the disease only by not survive to who has the disease Since most males with the disease do reproductive age, this is an extremely unlikely event. wh the d get the disease only by having parents are both carriers of disease. Because females cannot be carriers, this impossible even parents carry the recess allele tat causes rosis, the chance that theirchild will 35. disease is c, two in five. develop two. d. 100%. a. in b one in four

Solution

Here Answer 1: c

Monohybrid cross involves one trait whereas Dihybrid cross is a cross between 2 different that differ in 2 observed traits having 2 different alleles. An example of a dihybrid cross: 2 pea varieties that differ in seed colour and form CcFf X CCFF

2:c is the answer

For a woman to be a haemophiliac, the gene has to be homozygous, which means that both the maternal and paternal X-chromosomes have to possess the gene for haemophilia (XhXh).This is only possible if the father is hemophiliac (father) and mother, a carrier. As this gene is rare/ not common in the population, this crossbreed is rare.

3. b is the answer 1in 4 (25%)

A child who has two changed gene copies will be affected.