Phenotype ratio atory Repon 34 Heredity A43 :9 the possible gametes of a dihybri

Question

Phenotype ratio atory Repon 34 Heredity A43 :9 the possible gametes of a dihybrid with a genotype of AaBb. yellow-round yellow-wrinkled :33 green-round green-wrinkled Possible gametes o tall-green ratio in t Phenotype ratio en dihybrid corn plants were crossed, each with a genotype of 'TtGg, what is the expected p he progeny ( tall, t dv art. C green, g = albino)? Recall that tall and green are dominant. tall-green tall-albino henotype dwarf-green dwarf-albino there are several trays of com seedlings that are progeny of a cross between tall-green dihy bnds. se d. In the lab, ed tray 3. Count and record the phenotypes in all these trays. Deterininc the observed phenotype ra r of each phenotype by the number of dwarf-albino plants and rounding to the nearest who en tall-green dihybrids. Each tray is the n notype ratio by dividing number Phenotype ratio tall-green dwarf-green tall-albino dwarf-albino Explain any difference between the expected and observed phenotype ratios. 6. DINKED GENES a. A dihybrid was crossed with a homozygous recessive for each trait, and the cross produced only two classes o progeny. How do you explain this? b. Why are more males color-blind than females? c. Determine the expected phenotype ratio of children from these matings I. Normal female (XX) × color-blind male (X(Y) 2. Carrier female (XXC) x normal male (XY) Examine the pedigrees shown here, and determine whether the inherited trait or o) is dominant, recessive, or X-linked recessive; = male: O female. 7. PEDIGREE ANALYSIS i. C.

Explanation / Answer

b possible gamets AB Ab aB ab

Phenotype

Tall green TTGG

Dwarf green ttGG

Tall albino TTgg

Dwarf green ttGG

6a] Aabb* aabb

the other dihybrid was a heterozygous for one trait and homozygous recessive for the other hence only two types of progeny were formed

6b] every 1 in 12 males suffer from colour blindness and 1 in 200 females suffer. colour blindness is a X linked disease since males have only one X chromosome they are more likely to express it if they recieve it. but since females have two X chromosomes it is rares in females

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