Dihybrid Inheritance

If tall (T) is dominant over dwarf (t) and round seeds (R) is dominant over wrinkled seeds (r). If the genotype is ttRr the phenotype would be

The number of offspring produced in F₂ generation of dihybrid cross is 1600. Find the number of F₂ offsprings with double dominant phenotype?

Crossing over does not occur in male Drosophila.

 How autosomal linkage and crossing over are somewhat related but different.

Autosomal linkage refers to the linkage of genes present on the sex chromosome.

Explain autosomal linkage and how it is different from sex-linkage.

The cross of two heterozygous tomato plants based on two characters is a monohybrid cross.

The ratio of cross between the two heterozygous tomato plants is 9:3:3:1

Explain the dihybrid inheritance and the genotype of rabbits in the cross.

The genotype obtained from the dihybrid cross of coat colours of rabbit is _____.

The pathway that determines skin pigmentation in dogs is governed by two unlinked genes (I and II). While gene, I determine the type of pigment, gene II is responsible for its deposition in skin cells. Allele $\mathrm{P}$ (gene I) results in a black pigment; whereas, p produces a brown pigment. While allele Q (gene $\mathrm{II}$) results in the deposition of pigment, q will not allow the same. Alleles P and Q are dominant over p and q, respectively. Lack of pigment deposition results in an albino phenotype. When two canines with genotype PpQq are mated, the phenotypic ratios of offspring would be

Which of the following represents the phenotypic dihybrid ratio?

A cross was performed between two parent plants of unknown genotypes. The offspring were segregated based on two flower characteristics i.e. flower colour [magenta $\left(\mathrm{M}\right)$ or white] and flower position [axillary $\left(\mathrm{A}\right)$ or terminal] and counted. The two genes responsible for these characters are not linked and segregate independently. Based on the information given in the table, predict the genotypes of the parents.

The maximum number of different gametes of the pollens produced by a tall pea plant with round, yellow, seeds of the genotype $\mathrm{TtRrYY}$, if the three loci are unlinked, would be

In a diploid organism, when the locus X is inactivated by locus Y, transcription of the locus Y is triggered. Based on this observation, which one of the following statements is CORRECT?

In Mendel's dihybrid cross, homozygous, dominant, round, yellow seed parent was crossed with a homozygous recessive wrinkled green seed parent. If the round seed shape $\left(\mathrm{R}\right)$ is dominant over wrinkle seed shape $\left(\mathrm{r}\right)$ and yellow seed colour $\left(\mathrm{Y}\right)$ is dominant over green seed colour $\left(\mathrm{y}\right),$ what is the expected percentage of obtaining ${\mathrm{F}}_2$ progeny with wrinkled yellow seeds in the ${\mathrm{F}}_2$ population in the dihybrid cross? No linkage is there between the two genes.

In a dihybrid cross, the phenotypes are: round & yellow; wrinkled & yellow; round & green and wrinkled & green seeds. What is the probability of wrinkled yellow seeds in the above cross?

A pure long-winged, grey-bodied female fruit fly is crossed with a vestigial-winged, black-bodied male fruit fly. The expected percentage of long-winged and grey-bodied insects in ${\mathrm{F}}_1$ generation is

Out of a population of $800$ individuals in ${\mathrm{F}}_2$ generation of cross between yellow round and green wrinkled pea plants, what would be the number of yellow and wrinkled seed?